As a traveler, shorts in Europe are problematic for a few reasons. They are not allowed in most churches unless they cover the knee. They are not allowed in upscale restaurants.
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Men can wear shorts, as long as they level at the knee. Offensive tattoos: Tattoos are allowed. However, the Vatican dress code does not allow entry to those who have tattoos that may be considered offensive to Catholic morality, the Catholic religion, or to common decency.
It is acceptable to wear shorts, whether you are a woman or a man. However, NEVER (and I do mean NEVER) wear shorts if you want to visit a church or monastery. Also, if you plan to do a walking tour of Athens, ditch the shorts and opt for a dress – if you are a woman – or a pair of long pants – if you are a man.
To not stand out as a tourist, wear what the locals wear--- neutral colors, scarves, and layers. Second, tourists should look like they know where they're going even if they don't. Standing on the street, looking confused, and staring at a map easily identifies people as tourists.