My Chico's Travelers collection outfits are wearing out, and I'd like
to find similar items to replace them with.  Specifically, I am
interested in 3-piece business casual pantsuits in a single solid
color (or closely coordinated) that are machine washable and look good
(not polyester knit).
Some examples are:

- Chico's Travelers ("http://www.chicos.com/store/collections.asp?n=tb&ID=1")
- Draper's Signature knits (e.g.,
"http://www.drapers.com/jump.jsp?itemID=92296&itemType=PRODUCT&iMainCat=0&iSubCat=0&iProductID=92296&SearchString=signature&isClear=false")

The reason I don't get the above is they don't have sets in reds
and purples (e.g., eggplant), my favorite colors.

I'd want to spend no more than about $150 for three pieces
(tank/shirt, jacket, pants) in Misses sizes.

Have you tried searching eBay? I know there are several manufacturers
that produce similar items to the Chico's Travelers line; there's
Jostar, and Weekenders, Slinky and Citiknits. The "home shopping"
channels often carry these lines as well.