Small things? Like make a 12 foot tall ogre wearing only a loin cloth appear as a large human in an old suit and hat? Who was, when so glamoured, able to fit through doors that he couldn't at full size without cracking the frame?
Personally, I wouldn't let glamours do that. Glamours changes the appearance of things, not the thing itself; if you've got Hulking Size, glamours won't help.
On the other hand, Human Guise *would* do exactly what you describe, and is explicitly a -0 power.