I have heard a couple people say they liked pulling in their boss suits. I have also heard some people say they like the metal deadlift suit. These aren't people I know, I have just read comments on the internet. I have used neither so I can't comment personally.
I have used my Frantz poly squat suit to pull sumo and like that. Recently I used my poly squat suit to pull conventional, but I don't think it really gave me anything, it just made it uncomfortable to get to the bar.