I'm a #2 as well. One thing I did years ago was try to eliminate duplicate clothes, or use things for more than one season... so I use tank tops and leggings year round. As "long johns" in winter and as appropriate in summer.

Also, mostly I dress in solids rather than patterns, because I found a book which said explicitly that pattern styles change much faster than colors go in/out of style.

I haven't tried your limited color palette, that sounds like a great idea!