@Claire This one has worked well for me for over a year… walking, jogging, hiking, and even with regular pants and my shirt tucked in. It’s still just a good as the first time I wore it. The price is right and has a 4.5 of 5.0 rating from almost 8,000 buyers. Make sure you watch the video presentation.
ComfortTac XL Ultimate Belly Band Holster for Concealed Carry | Black | Fits Gun Smith and Wesson Bodyguard, Glock 19, 17, 42, 43, P238, Ruger LCP, and Similar Sized Guns | for Men and Women
I do not like shirts with holsters built in. My training has always been from the waist so that is my carry preference for this purpose and EDC. I’m going to try another belly band, if it doesn’t work I will return it. I saw a post on an all ladies running/hiking while carrying group - the poster uses a belt with an actual holster. That may be another option with some modifications.