NebilityWomens' Waist Trainer Tummy Control Waist Cincher Slim Body Shaper

will it be noticeable under tight clothes such as bodycon dresses?

If I’m 5’2”/5’3”, i weight 118 pounds and wear a 3/4 in jeans, what size should I get?

Can this be worn at the gym?

Does it cut into your armpits?