I LOVE new-clothes smell.
Once I googled "new clothes smell" and someone said that it was from all these toxic chemicals, but surely there's a way to make a detergent that imparts new-clothes smell to old clothes. I mean, if they can make detergent smell like a meadow, why not? I'd buy it in a second!
But as for the stores, I think it's just because they're new. I used to work in a clothes store for a while and we never sprayed the clothes with anything.