New answers tagged middle-east
I would personally take that sign to mean 'no strutting around in the nude', aka it's acceptable to quickly change but not for longer than necessary.
What people usually do is putting on their boxers/underwear in the shower cubicle then come out and put on the rest. Some people do what Burhan described in the other answer as well.
Wrap a towel around your waist (or use a dressing gown/shower gown and face the locker) and then change your trunks/shorts.
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