I have been a motor engineer for 40 years
And used to wear Dickies overalls 20 years ago
i was looking for a thermal set so i could just wear a tea shirt underneath
They are fantastic well-made and fit well apart from the leg length is long but easy to adjust
Medium will fit someone 40 to 44 chests 6 foot tall
also oxhouse country store is where I purchased mine fast delivery and trustworthy .