I didn't have any outfits ruined. I did have some fun accidents that I actually enjoyed and considered making glams before that now won't happen. Also used to randomly hit a bunch of glam plates and see what goofiness came out. I think it's a small price to pay for the giant benefit we gained.

I haven't found that my glam plates break my portraits unless the plate includes a weapon for a job that isn't the job on the current portrait (for instance, I have a shared PLD/DRK glam with PLD weapons on the plate--the DRK portrait ALWAYS breaks). Then there seems to be no fixing it, that portrait will never work right.