I would love to find a HRM bra for running, the kind that have the sensors built in and have snap attachments for the HRM itself. I just tuck my HRM under my bra band for cycling but this isn't secure enough for running unless I tighten it quite a lot (and then have trouble with stitches).

I have ordered a Pure Lime one in an A cup...and the cups are saggy. Is there a crop top option out there or any other brand that you would recommend?