Can you tell us what clothing you purchased and what is happening when you are loading it?

There can be any number of reasons including a common issue.  You may have purchased a texture set for an item you either don't own or don't have loaded.

If the clothing is designed for V4, it should work in DS with no problems.  The current version of DS has full legacy capabilities. 

Without knowing what the product is and what is happening, we are kind of shooting in the dark when it comes to giving assistance. 

A word of advice.  Don't get into the app debate.  As soon as a thread descends into the this app has this and this one doesn't or this one is free and this one isn't, the thread will end up locked.