Disneystores will probably NOT be able to help. Across the stores, some have no sensors (thus no removal system), other have one of several different security tag systems (some long rectangles, some round, some short fatter rectangles, etc). We can't even remove one from another store, much less the parks. (but we are happy to do so, if we CAN). Some guests find luck in spotting another mall store with the same sized security tag buttons. Other retailers are usually fine to assist you, which is very nice of them.
This is true. I bought cute bathing suits for the girls to where for our Disneyworld vacation from our Disney Store at the mall. When we got to Disneyworld, I noticed the security tag on one of daughters suits. None of the stores at Disneyworld could take that silly tag off! Luckily we had several suits to wear.
but they are so much easier to remove than you'd think!