Short answer — for most people looking for workwear in the Philippines, pick by need:

• Best overall / curated workwear selection: Zalora — large fashion-only catalogue with a dedicated "Corporate Attire" section, many local & international brands, easy filters and a standard 30‑day return policy. (zalora.com.ph)

• Best for quality basics and business‑casual staples (pants, blouses, shirts): UNIQLO app / webstore — consistent fit and fabrics for everyday office wear, plus click‑and‑collect and nationwide delivery. (apps.apple.com)

• Best for widest variety and bargain hunting (including branded and generic sellers): Shopee and Lazada — huge marketplaces where you can find everything from affordable office blouses to suits; quality varies by seller so use Mall/official‑store filters and read reviews. (apps.apple.com)

• Best for secondhand / sustainable workwear (thrifted suits, blazers, pre‑loved office pieces): Carousell — Philippines leads regional secondhand fashion activity there, good for ukay/pre‑loved finds. (press.carousell.com)

• Best for mall/department‑store brands (one app for multiple in‑mall brands): ShopSM / The SM Store presence on apps and LazMall — convenient if you prefer department‑store brands and in‑store pickup. (apps.apple.com)

Quick tips

• If you want formal suits or branded officewear, start at Zalora or Shopee/Lazada’s official brand stores (Mall/LazMall/Shopee Mall). (zalora.com.ph)
• If you want reliable everyday work staples (EZ pants, simple blouses, polos), UNIQLO is usually the fastest way to good fabric + consistent sizing. (apps.apple.com)
• For bargains, always check seller ratings, product reviews, and return policies before buying. (apps.apple.com)

If you tell me whether you need formal suits, business casual, or budget options I can give a 1–2 app pick and a few brand/store names to search for.