For a night out, a pair of nice jeans is much preferred. Shorts 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.
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The easiest rule to follow is to keep your knees and shoulders covered when deciding what to wear in Thailand. Though no one will prohibit you from entering anywhere for how you are dressed, except temples and the Grand Palace, it's best to dress a bit more conservatively in Thailand.
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'.
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.
Men are expected to wear conservative collared shirts and shorts that come to the knee, although pants are preferred. T-shirts are ok, but a dressier shirt, whether short-sleeved or long-sleeved, is preferred. Women must cover their cleavage and shoulders and wear pants or skirts that are at least knee-length.
What Not to Wear in Thailand. There's a few things you probably won't want to wear in Thailand. In general I never pack booty shorts, strappy tank tops, leggings, or heels to Thailand. Unless you plan on going clubbing in Bangkok I would definitely leave the heels at home.
Shorts or trousersWearing them is fine, especially when you have a stylish pair. For a night out, a pair of nice jeans is much preferred. Shorts are pretty common in most bars catering towards Westerners, and they're fine in many casual Thai nightspots too.
Dress appropriately for the place we're visitingIf we truly want to blend into a crowd, we shouldn't wear anything that will draw attention to us such as that colourful Hawaiian shirt or baseball memorabilia from home. Additionally, it's imperative to be respectful of local cultures and customs.
Watch What You WearAvoid bright-colored clothes and wear muted colors instead. Ditch the white sneakers, bulky cargo shorts, and yoga pants, and opt for comfortable shoes and casual pants like khakis. Forget the fanny pack and hulking backpacks. Carry only what you need.