She an avid runner and quite fit, but you would never notice the pistol.
Not for lack of looking. ;)
I read a Perry Mason book if I remember correctly and one of Paul Drake’s female operatives had a bra that somehow accommodated a small pistol. It was many years ago and a very beat up book.
“I know a woman that would love to have one that would carry a .38 Hammerless Lady Smith.”
Look into Flashbang holsters. They have a pretty full lime of bra-mounted holsters for small to medium wheel guns and semiautos. Mrs. Afteguard has used them.
Girl Friday bought leggings from the Glock Store. Carries her Glock 43 and a spare mag comfortably, securely.
http://www.glockstore.com/Original-Concealment-Leggings