You’re at some weird camp site where the only thing you’re allowed to carry to the shower block is a towel and soap.
It’s the end of a day of moderate activity and you are in need of a shower. You’re not muddy or noticeably dirty, just the sort of sweat and grime that your own body might produce after a day of walking around in the same clothes.
Because of the above-stated rule of the site, you are faced with two broad choices:
1: Wear your existing clothes to the shower block, then after showering, dress back into your unclean clothes, walk back to your accommodation, then change there into clean clothes
2: Change into clean clothes before walking to the shower block for your shower
Which is your choice? Remember, you can’t carry additional clothes in either direction, even if you somehow conceal them.