Based upon my observations, I think that any good clothes make you feel more powerful and more attractive. Especially if you have a decent body.
The only thing you need to keep in mind is...what kind of women (and people in general) you want to attract?
When I was wearing my suit (I was on my way to the Uni, had a presentation to do, so I needed to look serious) with all accessories (tie, shoes, expensive Swiss watch...), I drew attention of women who obviously are looking for a walking ATM and Dildo machine. They want me...but I don't want them. Not to mention that they are older (25+, and I do not date them, unless their second name is Gates or Jobs).
On the other hand, when I wear my leather jacket (biker style) and a good pair of jeans and boots, I tend to attract younger women, which look for fun. Mostly girls who are at Uni, or even High School. I prefer that type of girls (less baggage, and better LTR prospects), so I focus on that style ( they call it "Canadian woodcutter style" here ).
What I want to say is that you can feel powerful regardless of clothing you are wearing. "Inner game" and a good psychique are the key. The only difference is with what kind of people you want to interact with (i.e girls).