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.
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.
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'.
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.
If they agree to go with you and you wish to take her out before the bar closes, you have to pay a fee (around 300-500 Baht) known as a “bar fine”. This is to compensate the bar for the time that she is out of the bar, where she would normally be entertaining and attracting more customers.