Wolverine Men's Steelhead Stretch Canvas Snap-Up Shirt Jac

Does the canvas fabric feel stiff and restrictive when bending or lifting?

No, it is built for easy movement. The shirt-jacket incorporates integrated stretch canvas technology, providing just enough flexibility in the weave to prevent the shoulders and back from pulling tight when you are reaching, lifting tools, or working overhead.

Can this be worn as a standalone shirt, or is it strictly an overshirt?

It is highly versatile. Because of its medium-weight stretch canvas fabric, you can comfortably wear it buttoned up as a heavyweight standalone shirt directly over your skin, or wear it open as a rugged overshirt jacket layered over a t-shirt or hoodie.