You get 108 total apparel "cards".... each item can be given multiple cards. So you could have been given 27 cards for four different apparel items totaling 108 cards overall.
For example to get to a Level 10 common item (any item) you'll need to acquire 1,887 total cards for that item.
It's generally accepted that the return on credit for buying apparel packs isn't there to make the purchase worthwhile.