From personal (literally) experience, I skydived for many years and had several suits for different disciplines. I had a fast suit (belly to earth) for when I was skinny that was made of nylon and was fairly tight. A cotton and cordura suit that was fairly tight also for slower fall rates (had to buy this one for when I became heavier and more bullet shaped). I had a loose cotton suit for head down, sit, and standing (freeflying). I had a "Pro ditter" that would record fall rates and belly with skinny suit i fell as slow as 125 and as fast as 170. 170 was flying with freeflyers, belly with elbows in and fists in chin with heels in my ears. My slow belly suit I could slow to sometimes slower than 110 and as fast as 140. Freeflying is a whole other story, have gone 225 in a stand. So, at those speeds the fabric made a huge difference in speed. By the way, in a track, we could go close to 100 mph horizontal and the slowest vertical in a track I went was 94. Had to really make your body into a wing.

Brooks