Here are well-regarded online stores in Singapore that sell organic (or primarily organic / certified-organic) clothing, grouped by type and with a short note on what each is best for:

• ZERRIN — curated multi‑brand marketplace and sustainable-fashion hub (women’s clothing, accessories). Good if you want a single place to browse many conscious labels. (shop.zerrin.com)

• Source Collections — Singapore basics brand (tees, tanks, underwear) using TENCEL™ and certified organic cotton; transparent about factories and pricing. Great for everyday organic basics at accessible prices. (thehoneycombers.com)

• Esse (Esse The Label) — local womenswear brand using organic cotton, TENCEL and bamboo fibres; focuses on timeless, small‑batch pieces. Recommended for sustainable wardrobe staples. (krisworld.singaporeair.com)

• Sui / We Are Sui — independent label that uses handwoven and organic cotton options and highlights artisan production; good for unique, responsibly made pieces. (sg.wearesui.com)

• Sea Apple — Singapore children’s brand moving to GOTS‑certified organic cotton for many pieces; ideal for modern, organic baby & kids’ clothing. (seaappleshop.com)

• Kalila Organics — GOTS‑certified organic babywear (established organic kids’ label available in/through Singapore). Use this for certified organic newborn and baby basics. (kalilaorganics.com)

• Little Baby Organic / After Organic / curated baby retailers — local online retailers that stock many organic baby brands (good for one‑stop shopping and comparisons). (littlebabyorganic.com)

• We Are Minimal (WeAreMinimal) — gender‑neutral, minimalist basics made from organic/natural fibres (Singapore label noted in local organic guides). Good for simple, sustainable everyday pieces. (bellamysorganic.com.sg)

Quick tips when shopping:

• Look for certification labels (GOTS, Oeko‑Tex, OCS) if you want verified organic standards.
• Check fabric content (100% organic cotton vs blends) and product care (some natural fibres need gentler care).
• Expect higher price points than fast fashion — weigh cost vs durability and ethics.
• For kids/baby items, prioritise GOTS and non‑toxic dyes; for adults, check brand transparency about factories.
• Many Singapore sellers offer local shipping and occasional free‑shipping thresholds — check shipping/returns before checkout.

If you want, I can: narrow this to women’s or men’s stores only, pull out only GOTS‑certified brands, or show a few specific product picks (with current prices) from any of the stores above.