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'.
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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.
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!
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.
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.
Women must cover their cleavage and shoulders and wear pants or skirts that are at least knee-length. One of the best pieces of clothing you can pack is a shawl because you can wrap it around your waist or drape it across your shoulders and chest if you are visiting a temple. Chances are you'll see a monk at a temple.