class specific glamour and job swap

If I have a job specific item glamoured and I switch to a job that uses that item in the gear set, will the glamour dispel or just not show?

My Prototype Gordisn healer pants are used in all three healer sets but they're glammed to my WHM AF1 set.

Don't care if its not shown, but I really don't want to have to reapply it.

The glamour will simply not show.
It will remain glamoured and appear as intended when you switch the job that is able to wear such glamours. You need not re-apply a glamour prism to it.