If you are wondering where to buy big size clothes in Bangkok, the most dependable answer is Uniqlo: its Thai online catalog lists many basics, from T-shirts and shirts to easy pants and denim jackets, in sizes up to 3XL, and you can check sizes online before going to one of its large stores in the city's main malls. H&M's big Bangkok stores and the wholesale fashion malls of Pratunam are the other places to look, with more variety but less certainty about sizes.
Letter sizes differ from brand to brand, so it pays to know your measurements in centimeters and to check stock before you travel across town. This guide sticks to what the retailers themselves publish.
Uniqlo: sizes up to 3XL, checked online first
Uniqlo is the easiest place to find larger sizes because you can see exactly what exists before you go. In Uniqlo Thailand's online catalog, checked in September 2026, items such as the DRY-EX T-shirt, the UT graphic T-shirts, broadcloth shirts, the denim trucker jacket, EZY barrel jeans, Warm Stretch Pants and several women's easy pants run from XS to 3XL. Barrel Jeans are sold by waist size up to 38 inches.
Not everything goes that far: many of the women's dresses in the same catalog stop at L or XL, so check the size list on each product page. Uniqlo also notes that sizing can vary between designs, even at the same labeled size, and asks shoppers to compare the size chart for each item.
Which Uniqlo stores to visit
Uniqlo's store locator classes seven Bangkok branches as large-scale stores, the ones most likely to have the widest stock:
- Siam Paragon (1st floor, Rama I Road)
- CentralWorld (3rd floor, Ratchadamri Road)
- EmQuartier (2nd floor, Sukhumvit Road)
- ICONSIAM (2nd floor, Charoen Nakhon Road)
- Central Park (2nd floor, Rama IV Road, Silom)
- Central Rama 9 (G floor, Rama 9 Road)
- Fashion Island (1st floor, Ramindra Road)
All seven offer Click & Collect, so you can order the size you need online and pick it up in the store rather than hoping a larger size is on the rail. As of late September 2026, the stores' own notices say same-day pickup is temporarily unavailable and orders can be collected within two to three business days, so order ahead. Uniqlo also alters Uniqlo items at all its stores nationwide, with no time limit after purchase, which helps when a larger size fits the body but is too long in the leg.
H&M's big Bangkok stores
H&M's official store directory lists three Bangkok flagships, at Siam Paragon, CentralWorld and EmQuartier, and its ICONSIAM store carries the widest set of womenswear lines of any Bangkok branch in the directory, from H&M Womenswear and Denim to Edition, Move and Casual. The directory does not list a dedicated plus-size line at any Thai store, so treat H&M as a place where larger sizes may be on the rail rather than a guaranteed stop, and ask staff to check stock.
Siam Paragon and CentralWorld are close together in the Siam and Ratchaprasong shopping district, so a single afternoon can cover the Uniqlo and H&M flagships in both malls.
Pratunam and Platinum Fashion Mall
For choice and low prices, the Pratunam wholesale district is the other option. Platinum Fashion Mall on Phetchaburi Road describes itself as a wholesale and retail fashion mall with more than 2,500 shops selling menswear, womenswear, bags, shoes and accessories, open from 9 a.m. to 8 p.m.
The mall does not publish which shops stock larger sizes, and small independent stalls vary a great deal, so go with your measurements and try things on where you can.
Tips for finding clothes that fit
- Measure in centimeters. Chest, waist, hip and inseam in centimeters make Thai size charts far easier to read than letter sizes.
- Check online before you travel. Uniqlo's catalog shows which sizes exist for each item, and Click & Collect saves a wasted trip.
- Go to the biggest branches. Flagship and large-scale stores in Siam, Ratchaprasong, Sukhumvit and at ICONSIAM hold the widest ranges.
- Use alterations. Buying the size that fits your widest measurement and having it shortened is often easier than hunting for an exact fit.
Where to stay for a shopping trip
If shopping is the point of your trip, stay near Siam or Ratchaprasong. Siam Kempinski Hotel Bangkok is linked to Siam Paragon by a covered walkway, and Anantara Siam Bangkok Hotel calls CentralWorld and Siam Paragon a short stroll away. On the river, The Peninsula Bangkok runs its own shuttle boat and tuk-tuk to ICONSIAM. For more ideas, see our Bangkok shopping and Bangkok hotels pages.
Sources: UNIQLO Thailand store locator, UNIQLO Thailand online store, UNIQLO Thailand, how to check the size chart, UNIQLO Thailand, store alteration, H&M Thailand store locator, Platinum Fashion Mall. Checked September 26, 2026.
Uniqlo is the most reliable option: many items in its Thai online catalog run up to 3XL, and you can order online and collect at stores such as Siam Paragon, CentralWorld, EmQuartier and ICONSIAM. H&M's flagship stores and the Pratunam wholesale malls are worth browsing too, but they do not publish which items come in larger sizes.
Many Uniqlo Thailand items, including DRY-EX T-shirts, UT graphic tees, broadcloth shirts and several easy pants, are listed from XS to 3XL, and Barrel Jeans go up to a 38-inch waist, according to the online catalog checked in September 2026. Some styles, including many dresses, stop at L or XL.
Yes. Uniqlo's store locator shows Click & Collect at its large Bangkok stores. As of late September 2026, the stores' notices say same-day pickup is temporarily unavailable and orders are ready within two to three business days.
Yes. Uniqlo offers alterations for Uniqlo products at all its stores in Thailand, with no time limit after purchase. Some types of pants are not eligible, and non-Uniqlo items are not altered.
H&M's official store directory does not list a dedicated plus-size line at any Thai store. Its Bangkok flagships are at Siam Paragon, CentralWorld and EmQuartier; ask staff about larger sizes in the lines they stock.
The mall lists its opening hours as 9 a.m. to 8 p.m. It is on Phetchaburi Road in the Pratunam area of Ratchathewi.
