I use a Polar heartrate monitor myself - it helps to make the contacts wet (depends on the system I guess - I just let water run over my strap and the contacts of the actual monitor).
If the strap is very loose this could be a problem too. Could you just cut the strap and sew it back together in a tighter position?
Is it possible that the band of your bra interferes with the monitor (some of my sportsbras tend to flip the monitor over)?




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My suggestion was to use a sports bra made for heart rate monitors... Polar or Nike whomever makes them. I'm NOT suggesting using a Polar transmitter with a garmin...I thought perhaps that sports bra would help hold the transmitter in place... regardless of whether you use Polar, garmin, Sigma or Vetta.
I don't think I'd do that to a Garmin strap. Cripes, their cadence sensors aren't waterproof. 
