I'm wearing these RIGHT NOW.

Dickies is my go-to company for clothing as of late. And these coveralls are fantastic. They don't feel too light, but yet not as heavy as like. Denim.

I read other users' recommendation to order a size larger, I.E.;
If you wear a medium, get a large.

I'm a fairly trim fella of 5'10", 170lb and got a Large Regular and it fits comfortably! The legs are the same length as my pants, the arms go to about my elbows and I have a full range of mobility without any tightening in any areas. :) Super good stuff. I look forward to working on my future car(s)!