Question:

Planning to be in Isfahan in August, temperatures might be above 40°C during the day. Would it be ok to walk around with shorts, or do I need to wear long trousers?

Answer:

Dress attire for men is similar to that in Europe. The strict dress code for men in Iran prohibits short trousers and short sleeved shirts and t-shirts. Although you would not see Iranian men dressed in shorts, you will almost certainly see men wearing short sleeved shirts and t-shirts. Sandals and flip flops without socks are acceptable for both genders and make no problem.

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