MIL (when at the beach today with DH, me and the kids) and it was sunny (ish) wanted to tan her legs so took off her jeans - leaving her only in a short vest top and pants
. The sun went in and came out a few times. Her jeans did the same - skinny jeans so NOT easy to put on and off discretely or quickly.
Beach was rather full.
She did have a skirt on before going to the beach but changed into jeans for the walk down 
She also used to take off her top and sunbathe in MY garden in her bra that is when she came here and it was sunny which was rarely.
My garden is shared.
I cringe.
AIBU to wish she did not do this?
Mind you she is the woman who asked me if I was smiling because I 'got it last night'
i still cant believe she said that i was smiling at my lovely children thank you very much and you should be so rude about your son to me either
I said nothing BTW.