Here is my first pair of IH denim.
Initially, after researching a bit, I thought I needed the 888S-21. However, after trying them on I found the 888 was too roomy in the top block, at least for my body shape. I returned those went went in the opposite direction and pulled the trigger on the 555S-21 and I'm quite happy with them. Maybe a touch more taper from the knee down would be spot on for my taste.
6'1" 225lbs, IH size 36 555s-21