What to do about my small closet?

I have a normal sized closet, but with only 1 rod, and huge water pipe that cuts off about 1/4 of the closet. And I own a fair amount of clothes. This is in an apartment, so I need something I can take with me when I leave. Out of desperation, I bought a cheap garment rack on wheels, which will suit me for now, but I don't have anywhere to put it besides out in the open, and I don't want my apartment to look like a boutique. I know there are closet doublers, but I am wondering how well they work or if anyone else has some good ideas they have used in their closets. Thanks!