Are you sure that you've downloaded clothes and not just textures for clothes? Have a look in the zip and see if there's actually a cr2 (and/or an obj file) - if all there is are .jpg's and .pz2's, then it's a matpose with textures, not actual clothing.

I remember falling into that trap a few times when I started out with Poser (only, at the time, MAT poses hadn't been invented yet LOL)

I'm not sure what you mean about expressions? Which character are you using? There should be morphs present on the head to change the expression to whatever you want :o)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.