Suffocate yourself please

So the other day I went on my shopping trip..all alone...unescorted by anyone
speaking Japanese. I came across this nice sweatshirt and went to try it in the
fitting room. Now thats when I come across this poster in the room :

Hmmm...so I cant read Japanese...but the univeral language of visual tells me
to not cover my head with a bag..no,no, it tells me to cover my head with a bag !!
Indeed it does, for I can see a box with bags lying around.
Strange...so is it to prevent hair from getting on the clothes you try ?
So I click a pic of it(thats why I carry my iphone around).
I ask Jun, my team mate who knows Japanese what it means and turns out
you require to put a bag on your head to prevent the make-up from your face
getting on the clothes.

Of course.