Carhartt's fit terminology — original, relaxed, traditional, loose — gets jumbled at the counter. Forget the names for a second. The real question is whether you're wearing a tool belt.
If you wear a tool belt — relaxed fit. The relaxed fit has more room in the seat and thigh and a higher rise that won't ride down when the belt is loaded with 15 lbs of gear. Carpenters, electricians, mechanics, anyone whose pants need to live under a belt of tools — this is the answer.
If you don't wear a tool belt — original fit. Closer to a standard American work pant. Sits at the natural waist. Slimmer through the leg without being slim. Works for warehouse, light construction, landscaping, restaurant back-of-house.
"Pick the fit by the belt, not the brochure."
If you're a bigger guy or layering thermals all winter — loose fit. Maximum room. Some guys wear loose fit year round; that's a personal preference call.
The other thing to check is the rise. Carhartt's original fit sits about an inch higher than competing brands. If you're moving over from Dickies you'll feel the difference immediately. Some guys love it, some guys size up to compensate.
Try them on at the shop. Wear your belt. We'll tell you straight whether it sits right. Carhartt lineup is the deepest wall in the store.