That includes the boys from Savile Row.

Ari’s The Decorum has become the Bangkok go-to for guys after that comfortably classic menswear look espoused by trending international tailors like Hong Kong's Armoury and Singapore's L.C. Via.
It first broke onto the scene with the shirts of Japanese label Kamakura, a favorite of big shots after that perfect Pinterest-worthy collar roll on their shirts. Now, owner Sirapol Ridhiprasart (follow him on Instagram @master_keynes for a lesson in how well-cut suits should look) is also turning the store into a hub of sartorial events and popups. 
You’re not too late to catch L.C. Via in person on Aug 24-26, nor Japan’s maker of pleated trousers extraordinaire, Igarashi Trousers (Aug 24-25). Sirapol’s also using the Aug 24-26 window to launch his personal bespoke tailor service, also under the name The Decorum.  
Next in his roster of menswear heavyweights is the Huntsman Savile Row Trunk Show on Aug 30. If the name’s unfamiliar, Huntsman is the pedigreed London tailor making waves for its looks on Colin Firth in the film Kingsman.
The Decorum, Ari Samphan Soi 5, 086-533-5255. Open Mon-Fri 12:30-8pm; Sat-Sun 11am-8pm