Maitreya dev kit question

Hello CosmicInspector :) Yes, it was rigged fitted with maitreya dev kit from Zero... and it works like a charm, just this issue. On a dummy in blender it is tight on body, moves great with sliders and other movements. But when i import it in sl,  there is that awfull even gap :D And it is not a case just with panties, i made a shirt and tights also, and it is same...  Okey, i will try that you sugested, just tell me, before i move vertices should i unrig it and remove vertex groups and rerig it again after? Or i can adjust mesh rigged and just reimport it?