FAQ:How can I create clothes?
From MakeHuman Community Wiki
Clothes are created with the MakeClothes tool, which is a part of the BlenderTools, see MHBlenderTools: Download and installation .
The documentation on MakeClothes is a bit outdated, but can (when it's ported) be found at Documentation:MHBlenderTools:MakeClothes.
For now, following the video tutorials at Video:Blender_tools will probably be the best bet to get up to speed.