Shorts or trousersShorts are pretty common in most bars catering towards Westerners, and they're fine in many casual Thai nightspots too. For nightclubs in Bangkok and some other areas, men won't be allowed in without pants. Women can pretty much wear the right pair of shorts anywhere.
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Avoid Short SkirtsSo, unless you want to dress up in a Thai school uniform, you're better off wearing something a little longer. Above the knee is considered totally fine, but mid-thigh would be too short.
The basic rule is to cover your shoulders and knees (both sexes), and ideally, you'd cover your ankles too. On the bottom, wear longer shorts, capris, pants/trousers or a knee-length-or-longer skirt. On top, choose any shirt that fully covers your shoulders and has zero cleavage.
The dress code is simple really, for both men and women, knees and shoulders must be covered. Additionally, no see-through clothing or skin-tight clothing.
Of course, it is perfectly safe to wear a red shirt in Thailand! Unless that is you wear one and join a mass demonstration against the army's orders... Red is an auspicious color in Thailand cause of the Thai-Chinese, and Sunday is the 'red day of the week'.
By showing some discretion about what you wear you will win respect from your Thai hosts. Many Thai people will be wearing black or white, but this isn't mandatory. Tourists aren't expected to dress in the same way as Thai people, but showing respect will be appreciated by locals.
DON'T wear skimpy outfits.Safe to say, daisy duke shorts that let your buttcheeks hang out and spaghetti strap tanks that show too much cleavage and skin are not welcome in Thailand. It's a modest country and you'll find most locals wear clothing that covers them fairy well — you should do the same.
Thailand is probably one of the safest places in the world to crossdress openly, so if that's your style then you'll probably have a blast. Just make sure you aren't discarding chewing gum on the floor, you might end up with a hefty fine or spending the night behind bars!
Bottled water is very cheap to buy at the numerous 7/11 stores etc. Stick to bottled water for drinking. It is available everywhere and not expensive. However, the water is safe enough for you to have a bath, wash your hair, brush your teeth.