The main point of the interview is what you say so your choice of clothing should not be a distraction to you as you should be concentrating on your answers and not wriggling with that brand new shirt or sweating because all the other candidates wore something different. Things get blown out of all proportion in the stress of an interview.
I advocate certainly suit smart leather shoes and a favourite shirt and tie. There's something quite comforting about wearing something that makes you feel good at a time of high stress and it really DOESN'T matter what colour the shirt or tie is as it's quite a pleasant reflection of your personality at interview. Pilots have been recruited with dark blue / green shirts and ties. The caveat of course is that it's not offensive in anyway of course. Playing to the gallery by wearing military or club ties can backfire too, so play neutral on this one I suggest. Anyway wear what you feel comfortable in, including the Easy / SW ones. If it's not "you" to wear sweatshirts and jeans, don't do it. It's only going to grate on you through the day. Plenty of pilots get through Easy etc wearing suits.
Flight crew wear uniforms
Excellent posts here among the daft ones, but an additional one on personal hygiene....don't kill them with your garlic / rancid beer breath from your night before eats and drinks, and please spare us the soaked armpits on a hot day.