Tee Shirts are extremely cheap in Thailand with all the major brands available.

When visiting some Temples you will be expected to cover
your shoulders and knees for religious reasons. You must also wear closed footwear with sandals being acceptable. Covering your shoulders and knees is required for the most important Temples such as First Class Royal Temples.

Many Tailors are situated within Hotel Complexes for your convenience. For men, the suit package is usually a summer suit, 2 business suits plus 2 silk ties, 2 leather belts and maybe even a Silk Kimono thrown in. For women, the deal is usually for 2 business suits, a summer suit, 2 blouses, 1 dress, 1 silk scarf and a bonus like the kimono. Great Value you would have to agree...