I don’t see what the big deal is .
The gym should have left wear whatever she wanted as long as she wasn’t getting on a machine wear it could have gotten caught on .
It used to be common to wear a skirt over tights in dance classes . Capizio still makes them .
Yes...I have worn a skirt at the gym.. .lifting weights and on elliptical machine...but it was very short and over leggings...crotch covering actually...I try to have one with me so if I decide to run errands I have a little more modest dress...I guess at 64 I’m feeling a little more in need of modesty
.