I just diy'd our 2'x3' coat closet. It was the basic pole and shelf system with junk and shoes laying on the floor and the top shelf was a catch all. now it has a storage tower for shoes, boots, gloves, etc and two poles for coats, etc. I spent
$20 for mdf
$5 for a 4'dowel for clothes poles
$3 for plastic brackets for the poles
Leftover Screws and paint from other projects.
I found a lot of examples on Pinterest and yahoo. Just search reach in closet (or walk in closet) setups.