Well the best new trick is Compose. Once you've modelled a peice of clothing and it is cut-up/grouped to fit a Poser character you can use Compose to merge that object with your base character object. Save as a new object, point a cr2 at it, and your practically done...just a little JP work needed to get rid of unwanted distortion if the spherical fall-off zones are not big enough.

The other thing you can do is dress your character up in Poser with conforming clothing, export it as obj (with only the top check box checked on export), point a copy of the base figure's cr2 at it and viola! the clothing is permanently integrated.

The only part of this that gets difficult is if your base figure is a nude male. In that case you have to do some cr2 editing to get rid of the gen switch and the genital actor.