Carhartt Women's Relaxed Fit Lightweight Chest Pocket Short Sleeve T-Shirt

Can I wear this under a jacket or work vest without it being too bulky?

Yes. Because it is a lighter-weight fabric, it acts as an excellent layering piece. It is thin enough to fit comfortably under hoodies, flannel shirts, or work vests without creating excess bulk or uncomfortable bunching.

How does the "Relaxed Fit" sit on the body?

It is designed with a relaxed cut that isn't too boxy or too tight. It offers enough room through the shoulders and torso to move freely without feeling restrictive, which is a major advantage for active work.