I was dressed in old stretch pants (cotton & polyester, I think) and a T-shirt, and I fit right in. Nobody there was looking to impress. Even the instructor was dressed very casually. The range of ages is fairly wide, too. I was really delighted to be in there with other people, working out with others. It really does make it more fun.
I went to Scolari's after and grabbed a bag of trail mix and an orange. Gotta carb up quicklike after pumping iron, you know.
What a good move, joining the gym. What I needed.