CarharttMen's Workwear Pocket Short-Sleeve T-Shirt Work Utility T-Shirt

Q: what is the length of a 3xlt?

Its pretty long. It'll hind your belly

Q: How to use this product?

This is a shirt, meant to wear over your upper body. Feel free to reach out at 1 800 833 3118 with further questions.

Q: Why do these cost twice as much as they should?

I don't know what your definition of what they should cost is, but they are a high quality shirt designed for construction or industrial wear. I get twice the wear out of these that I get from competing brands. If you are just looking for a casual shirt for a good price you may want something else. If you want a workwear shirt that will last a long time this is your shirt.