Sometimes the conforming of clothes has this effect, though not that often in my experience. You need to go into each part of the clothes (eg, hip, chest etc) and make sure that everything is set up correctly - i.e. scale=scale of the figure you're conforming to, xscale/yscale/zscale are all at 100% and everything else should be set to 0.
If there's still an overlap, you can either amend the xscale, yscale or zscale - sometimes that works, or alternatively, you could hide the part of the figure underneath so that it doesn't show through.
If there's still an overlap, you can either amend the xscale, yscale or zscale - sometimes that works, or alternatively, you could hide the part of the figure underneath so that it doesn't show through.