Steve,
Looked in the FAQ, didn't find my answer there, so...
My Martial Artist is a normal Joe who can summon his Ch'i to become a super. I bought his powers as OIHID (there are no foci involved). There are also no intrinsic changes in his appearance. A costume is available, but not nesesary. It takes time, an extra phase, and an EGO roll to accomplish the Ch'i focus.
Here's the question; My GM says OIHID doesn't work that way. (and I know "the GM is always right". I've sat in the big chair myself, but...) He says I would have to stop and change cloths to be "in hero ID". I say the cloths don't make the (super)man. I think the key sticking point is the word "form" in the description of OIHID.
So, does a charater using OIHID need to change "form" (or cloths) for those powers to work, or is it the effort and time that really matters?