It may be November, but Real Estate Journal (The Wall Street Journal's guide to property) decided to squeeze in an interesting article on closet organizing before the holiday season.
Journalist Eileen Gunn scribbed a tester's experiences with a difficult closet configueration-- a jam-packed closet 18" deep instead of the traditional 24"--- the necessary size so coats don't pull with the door opening and closing. They shopped around using a variety of sources.
A California Closets in-home consultant, a Container Store in-store employee, an interior design student from a local college, a Professional Organizer, and a local carpenter provided expertise and ideas to improve the situation. They liked everyon's ideas, but who won the job? Check out the article and related table for the results.
What's our take? Sounds like the closet was designed exclusively for linens (the average comfortor needs about 18" of space...) so in short, we'd add a combination of straight adjustible shelving and slatwall, if they want to hold clothes and NOT rebuild the closet wall. We couldn't find a picture of a closet using slatwall, so here is an example of it's usefulness in the garage-- same theory.