Short answer — for polished, reliable workwear in the Philippines use Zalora or Love, Bonito (best for office-ready styles); use Uniqlo for dependable basics and slacks; use Lazada or Shopee when you want bargains, local brands or many sellers to compare. (Zalora.com.ph)

Why these:

• Zalora — large fashion marketplace focused on clothes, carries many office-friendly brands (Mango, H&M, Love, Bonito, Plains & Prints, in‑house lines) and has category filters (work dresses, blazers, trousers). Good balance of selection and curated fashion. (Zalora.com.ph)
• Love, Bonito — Southeast Asian womenswear brand known for “work-to-anywhere” pieces (blazers, tailored pants, sheath dresses) made with an office-focused fit and styling; now has stronger presence in the PH market (pop‑ups/stores + online). Great if you want contemporary, office-appropriate pieces made for Asian fits. (upsize.ph)
• Uniqlo (official app/site) — reliable basics and technical fabrics (wrinkle‑resistant shirts, comfortable slacks, easy-care blazers) that work well for everyday office wear and business-casual looks. (Uniqlo.com)
• Lazada & Shopee — biggest general marketplaces: best when you want bargains, many sellers and local capsule brands (or exclusive drops and LazMall/ShopeeMall official-brand options). Useful for wider price ranges but inspect seller ratings/reviews carefully. (Lazada.com.ph)

Quick buying tips

• For office wear prioritize fabric (rayon/viscose blends, gabardine, wrinkle‑resistant finishes) and structured fits (tailored blazers, straight/wide trousers).
• Check measurements (Asian sizing varies); read customer photos and reviews.
• Use the apps’ filters: “workwear”, “blazers”, “tailored pants” or brand filters (Love, Bonito, Mango, Plains & Prints, Uniqlo) to narrow results.
• Compare return policies and delivery times — Zalora, Love, Bonito and official-brand stores usually have clearer return processes than individual marketplace sellers. (Zalora.com.ph)

If you tell me whether you want corporate/formal suits, business-casual, Filipino‑inspired workwear (e.g., modern Filipiniana/barong), or a budget vs premium preference, I can recommend exact stores/brands and specific items to check on those apps.