Everything the scan holds on this record, grouped by subject. Blue bars show how much information is held; they are not positive or negative scores. Fields with nothing behind them are counted, not listed.
Features
3 of 5
Feature 1
Sustain by Kat states its fibres are 100% natural and organic, with cotton that is 100% organic from the fabric to the labels to the thread, and linen that is 100% natural and organic made from flax plants. The Sustain by Kat range also includes plant-dyed silk pieces such as silk scrunchies, hair ties and an Organic Silk Eye Mask.
Feature 2
Sustain by Kat sources high quality organic fabrics and natural dyes that are all locally manufactured in Los Angeles, with the remaining collections locally made and naturally dyed by ethical companies in the U.S. The Ayurvedic collection from Sustain by Kat supports small, marginalised communities in India by helping provide fair wages and safe working conditions.
Feature 3
Rather than petroleum-based dyes, Sustain by Kat colours its natural fibres with plant-based natural dyes including pomegranate peels, oak galls, rhubarb, myrobalan, madder root, fusticwood, logwood and indigo leaf.
Materials and composition
15 of 28
H3 Q8: Materials (adapts to brand: 100% cotton? / where is the linen from? / hemp?)
Is Sustain by Kat 100% cotton?
Plant fibre %
84.6
Animal fibre %
6.9
Fibre Breakdown
(97.1%) 100% plant; Plant 97%; Animal 3% (70 of 76 styles read)
Fibre Breakdown (table)
FibreStyles%Measure100% plant fibre (organic cotton, linen, hemp)6686.8%Naturalsynthetic (polyester, nylon, elastane)11.3%Syntheticanimal fibre (wool, silk, down)79.2%Animalno stated composition22.6%Unclear
Other materials: origin
Organic linen; 100% plant-based natural dyes
Products with a fibre list
15
Products with no fibre list
58
Incomplete composition explanation
No incomplete percentage compositions were recorded.
Plant fibre percent
89.2
Key facts plant materials
Cotton, Linen
Key facts animal materials
None
Key facts chemical materials
None
Key facts organic materials
Organic Cotton, Organic Linen
Key facts synthetic materials
None
Scan result
16 of 55
Scan note (above product table)
Provisional direct saved-SKU scan: 74 of 77 in-scope rows classified (96.1% coverage), 3 unresolved. Possible fully plant-SKU range 85.7-89.6% remains in score band 3/5. The saved export retains 0 row-level source URLs; this is not full-catalogue verified.
Score (1-5)
1
Score label
Low verified plant evidence
Total styles scanned
78
Last scanned
2026-08-04
Supply-chain summary
Sustain by Kat, a small Los Angeles brand founded in 2016, uses GOTS certified organic cotton and 100% plant-based natural dyes, and states every garment component (down to elastic and thread) is organic. Good On You rates it 'Good' (Planet 4/5, People 3/5, Animals 4/5) and notes it partly traces its supply chain including the final and some second production stages. However, Sustain by Kat does not publish an aggregate supplier breakdown or a named factory list, and there is no evidence of living-wage assurance.
Sourcing transparency score (1-5)
3
Full catalogue scan?
no
Publication status
direct_csv_provisional
Method version
Throne Standard direct CSV recalculation 2026.09
Worst-case complete result (%)
85.7
Best-case complete result (%)
89.6
Sustainability score
1
Key findings
Materials: Cotton, Linen
Made in: Sustain by Kat garments are made in Los Angeles, California, USA
Certifications: Sustain by Kat states it uses GOTS (Global Organic Textile Standard) certified organic cotton fabric, thread and labels; this is a certification of the materials/inputs, corroborated by Good On You and the brand's own product pages
Score status
verified
SKU scan date
2026-07-14
Health and safety
1 of 3
H3 Q6: Is [Brand] non-toxic / PFAS-free?
Is Sustain by Kat non-toxic and safe for skin?
Certification
6 of 9
H3 Q7: Is [Brand] GOTS / certified?
Is Sustain by Kat certified?
OEKO-TEX® Standard 100
Sustain by Kat clothing brand does not maintain OEKO-TEX® Standard 100 certification.
Other Certifications
Sustain by Kat clothing brand does not have any other sustainability certifications.
Cotton: type / certification
GOTS certified organic cotton (also uses linen, with hemp planned); every component organic (fabric, elastic, cotton sewing thread)
Factory certifications
GOTS (materials); Good On You notes final stage in low-risk or certified facilities
Key facts certifications
Sustain by Kat states it uses GOTS (Global Organic Textile Standard) certified organic cotton fabric, thread and labels; this is a certification of the materials/inputs, corroborated by Good On You and the brand's own product pages.
Sourcing and supply chain
15 of 61
Overall: where this info comes from
Independently verified
Traceability level
Cotton: country of origin
Wool: origin + farm + mulesing status
Polyester: virgin or recycled + source
Viscose / bamboo: wood-pulp source + FSC
Ownership and legal entity
2 of 17
Owner
Kat Quigley is the owner of Sustain by Kat.
Identity
19 of 28
Brand name
Sustain by Kat
H3 Q1: Is [Brand] sustainable / ethical?
Is Sustain by Kat sustainable and ethical?
Answer 1
DOCUMENTED (corroborated by brand + independent sources): founding 2016 in Los Angeles by Kat Quigley; LA manufacturing; use of GOTS-certified organic cotton fabric/thread/labels; use of plant and mineral-based dyes (e.g. pomegranate); silk used but no leather, wool or fur; slow/small-batch model. MARKETING CLAIMS NOT INDEPENDENTLY VERIFIED: the brand's "fair wages and safe working conditions acro
H3 Q2: Where is [Brand] made?
Where is Sustain by Kat made?
Answer 2
Sustain by Kat garments are made in Los Angeles, California, USA. The brand and multiple third-party sources state fabric is sewn into clothing in Los Angeles by a small manufacturer, and product pages carry the line "Ethically designed and manufactured in Los Angeles." Some inputs (such as the naturally dyed sewing thread) are produced in-house by the founder, and some handwoven fabric is sourced via a nonprofit charitable trust. The country of origin of the raw organic cotton fibre itself is not publicly documented.
H3 Q3: Who owns [Brand]?
Who owns Sustain by Kat?
Answer 3
Sustain by Kat was founded in 2016 in Los Angeles, California by Katherine "Kat" Quigley, who owns and runs it as an independent, founder-led brand with no parent company documented. Quigley holds a B.S. in Biology and an M.S. in biomedical engineering, and is described as founder and CEO; she was motivated during her first pregnancy by concern over chemicals absorbed through clothing. No investor or corporate owner is publicly documented, so the brand appears to be independently owned.
H3 Q4: Is [Brand] legit / worth it?
Is Sustain by Kat legit and worth it?
Answer 4
Sustain by Kat is a real, currently-trading legitimate business operating at sustainbykat.com with an active shop, product catalogue (womenswear, kidswear, accessories, fabric) and account/checkout functionality as of mid-2026. It is independently rated "Good" by Good On You and Sustainable Review, and listed on SustainabilityTracker and CommonShare, confirming it is the genuine Los Angeles plant-dyed organic clothing brand (not a same-name business in another industry).
H3 Q5: Is [Brand] fast fashion?
Is Sustain by Kat fast fashion?
Answer 5
Sustain by Kat is a slow-fashion, small-batch brand, not fast fashion. It explicitly positions itself around a "slow fashion" future, timeless basics, made-to-order/small-run production in Los Angeles, plant-based natural dyeing done in-house, and biodegradable/compostable garments. Its small scale, LA local manufacturing, and hands-on founder-led dyeing are consistent with slow/small-batch rather than high-volume fast fashion.
Answer 6
Certifications: Sustain by Kat states it uses GOTS (Global Organic Textile Standard) certified organic cotton fabric, thread and labels; this is a certification of the materials/inputs, corroborated by Good On You and the brand's own product pages. There is no evidence the brand itself holds a company-wide GOTS certificate, and no OEKO-TEX, Fair Trade, B Corp, or European Flax certification is claimed or documented. Note: Sustain by Kat publicly critiques GOTS in a blog titled "Where GOTS Falls Short," so it references GOTS at the material level rather than as a brand accreditation..
Answer 7
Sustain by Kat holds the following certifications: Sustain by Kat states it uses GOTS (Global Organic Textile Standard) certified organic cotton fabric, thread and labels; this is a certification of the materials/inputs, corroborated by Good On You and the brand's own product pages. Beyond any paper certification, our scan of 40 Sustain by Kat styles found 100.0% is 100% plant fibre, which is the measurable material fact behind Sustain by Kat's claims.
Methodology note (page footer)
How we scan. Every figure on this page comes from the Throne Standard scan: we read the fibre composition off each live product on the brand's own site, style by style, and count only single-fibre plant cloth (cotton, linen, hemp) as natural. Animal fibres such as wool, silk and cashmere and plastic-based synthetics such as polyester, nylon and elastane sit outside the plant-fibre figure, and regenerated fibres such as viscose, bamboo, modal and Tencel are counted as semi-synthetic. Percentages are calculated over the styles that state a composition; anything unlabelled is shown separately.
Answer 8
So many Sustain by Kat basics are pure cotton, but Sustain by Kat's fitted and active styles typically add a small share of synthetic.
Contact Email
info@sustainbykat.com
Cotton: named farm / region / co-op
Not disclosed
Dye house: name + country
In-house/plant-dyeing described (natural dyes, dye wastewater reused to irrigate dye crops); specific facility not named
Brand site readable
yes
Energy, water and land
1 of 2
Claims and evidence
8 of 17
Verified by
HTT research (brand policy pages)
Verification status
What this means
Excluded items
Why excluded
Excluded items
Place and access
1 of 1
Location
Sustain by Kat are located in Massachusetts in United States.
Delivery and shipping
3 of 3
Shipping
Shipping is not free at Sustain by Kat, with charges based on the actual carrier costs and typically between $3 and $10 for orders within the U.S. Dispatch of your Sustain by Kat pieces takes 1 to 4 business days as all orders are processed within this window.
Shipping International
Sustain by Kat offers international shipping worldwide, with international charges typically between $15 and $30.
Shipping Notes
All Sustain by Kat orders are processed within 1 to 4 business days.
Price and commerce
2 of 8
Price tier
$$
SKU count
78
Further detail
23 of 65
Excerpt
Is Sustain by Kat a sustainable clothing brand? See the real fibre breakdown, plant, animal or synthetic, before you buy.
Country
United States
POC
Sustain by Kat clothing brand ownership is not identified as people of colour.
LGBT
Sustain by Kat clothing brand ownership is not identified as LGBTQ+.
Woman Owned
Sustain by Kat clothing brand is a woman owned clothing brand.
GOTS
Sustain by Kat is not GOTS certified as a company, but uses GOTS certified organic cotton.
GOTS held by
na
1% for the planet
Sustain by Kat clothing brand is not a member of 1% for the Planet.
Vegan
Sustain by Kat clothing brand is a vegan clothing brand.
Report Post
61264
Clean & Safe: last checked
2026-07-29
Supplier disclosure
Partial
Products found
77
Last checked
2026-09-26
Products in catalogue
73
Products read
73
Catalogue read %
100
How it was read
Throne identifies the eligible textile products in Sustain by Kat's catalogue, inspects each product for published material evidence and requires at least 20 scoreable textile SKUs before publishing a brand score. The score uses only products with enough published material information to classify. Brand non-disclosure and technical read failures are reported separately. Non-textile products are excluded rather than counted as a pass or a fail.
Possible flags
3
Website check
page identifies as Sustain by Kat (checked 2026-08-18)
Coverage method pre dash fix
Every product listed in the brand's live catalogue is retrieved and its stated fibre composition read individually - from the product page, the store's own product data and its material labels. A fibre percentage is published only when 100% of the catalogue has been read. Items with no clothing textile (gift cards, packaging, jewellery, homeware) are excluded from the percentage rather than counted as a pass or a fail.
