Here are popular apps you can use in Singapore to buy luxury clothing and accessories, grouped by type and with a short note on each:

Multi‑brand luxury retailers (new items)

• Farfetch — global marketplace carrying thousands of designer brands; app available and services Singapore. (apps.apple.com)
• NET‑A‑PORTER — women’s luxury fashion app (part of the Net‑A‑Porter Group). (apps.apple.com)
• Mytheresa — European luxury retailer that ships to Singapore (has app/online store). (mytheresa.com)
• MATCHESFASHION (MATCHES) — curated luxury retailer with an app and international delivery. (apps.apple.com)

Regional marketplaces and department/fast luxury

• ZALORA (Luxe / Luxury section) — SEA fashion marketplace with a dedicated luxury/designer category for Singapore shoppers. (zalora.sg)

Pre‑owned / resale specialist apps

• Vestiaire Collective — major global pre‑owned designer marketplace with an app (authentication process). (apps.apple.com)
• The Luxury Closet — pre‑owned luxury marketplace (app available; ships to many countries including Asia). (apps.apple.com)

Local classifieds / recommerce

• Carousell — Singapore‑based classifieds/recommerce app; runs Carousell Luxury and certified inspection/Buy‑to‑Carousell services for authenticated or consigned luxury items. (apps.apple.com)

Notes and cautions

• Some Singapore‑familiar services (for example Reebonz) have had business changes in recent years — Reebonz suspended operations/was winding up in 2021. If you see an app or site you don’t recognise, check recent reviews and the company’s status. (mothership.sg)
• For any purchase from overseas apps, consider shipping costs, duties/customs and return policies (these vary by retailer and country).

If you’d like, I can:

• filter this list by new vs pre‑owned only, or by mobile platform (iOS/Android), or
• check which of these currently offer Singapore‑local returns or free shipping thresholds and give the most up‑to‑date shipping/return details.