I almost feel inclined to say it doesn't matter and that they won't remember ... but I'm not going to. I think you should wear a different suit. Maybe it's just a superstitition ... but you never know. You want a different outcome from last year, right? And even though it's probably not the suit that got you rejected, you never know. Be a different candidate. Wear a black suit.
It's funny you say that about superstition. Last year, I had two suits that I wore to my interviews and I ended up getting offers from the schools to which I wore Suit A and rejections from the schools to which I wore Suit B. Of course I know it wasn't the suit but...
As far as wearing the same suit this year, I agree with what was stated above, I highly doubt they'd remember it, and even if so, I don't think they would look at it negatively!