Duffer, a lot of women are catty, and unfortunately those do pay attention in locker rooms sometimes... I can't tell you the number of times girls in changing rooms looked at my flat chest and snickered when I was a kid... Including one really nice gym teacher who used to ask me why I even bothered with a bra...
I always changed in the shower. And, as an adult, I always felt like women were looking at me when I changed at the gym and thinking about how unattractive I was...Now, don't know if they were or not as an adult, but I know they were as a teenage girl and the damage was already done... Today, I could care less - I reached a point several years ago, well before I lost weight and got into better shape - where I didn't give a flip what other people thought in the locker room and started changing in the open at the gym. Was probably helped along by living through a community shower in my residence hall in college.
But hey, if I were a member of a gym I would totally be okay with getting naked now. I would however have to wear shower shoes or something, which I never did before. Oooo.