Namenloss

I'm relatively new to SL and I'm not exactly sure how all things work, so here's my first question: I just bought some items from the store, hair, shirts and pants and such. The one furry appearance that I bought worked out fine and I got it to work. But the other clothes and such aren't working, when I try to wear them they look like blocks that say what they are but they don't look like what they are supposed to be. I'm not sure what to do here so any help would be appreciated. Thanks. ~Lozi