Clothes are not easy to conform to anything else than the standard body shape of the character in question. You can play around with scaling the clothes or applying magnets to different areas of them. The most elegant solution is the software The Tailor (available in the Marketplace here) that allows you to transfer the morphs from your character to the clothes. The problem with the figure disappearing after double clicking on the clothes icon is something we all experienced. Make it a habit of always using the buttons below the icons in the right hand side menu: One check is replacing the figure with the one you selected in the menu, two checks is adding the figure.