dwHideUnderSkin

Allows you to hide/show elements while working with skin for example.

First you need to create poly groups by selecting them and pressing Add (switch to Editable_Poly in stack).
Then you will be able to hide/show those groups.

You can also use fast way to control visibility:
Double-Click : hide group
Double-Click + Alt : hide everything else
Right-Click : show all
Only downside is that you can't work with multi-selection like that.