One of the trainers who works at the gym where I was at today said that my technique was good. So I was building up with deadlifts, in the suit, and at one moment I thought that I had 160kg including the bar for my second last set. And as my last set I thought I had 170kg including the bar. But when I recalculated it my second last set was 170kg including the bar and the last one was 180kg. With the 170kg(5kg under my PR) it felt like I had 1 RIR. So I strongly recommend to be this suit.
Length: 171cm
Weight: around 120kg
Size of the suit 4XL