To hide a body opart select it, then click the Visible button in the Parameters palette or the eye icon next to it in the Scene palette. I usually use ctrl and shift to select all the parts I want to hide and then hit the Visible button. To save the state of the robe, use a Poser preset and chhose to include onlt the morphs and not the transforms. However, you need to pose Michael first - the morphs are done to fit the robe to his current position, they aren't dynamic so when you move him the morphs will need adjusting, and it looks as if you have him in the default position at the moment.