Sharma - for a fellow, double hanging (stacked 40 - 44" areas each) accommodates most pants, shirts and blazers. There are systems with racks that lower and raise that make triple hanging for things out of season.

Let's imagine four elevations - looking at the walls with the slanted ceilings and the end walls with window / doors.

You have the most height between the doors - why not put double stacked hanging there for 6'? - Or do open shelves and drawers there the depths of the door itself. 16" - 20" is deep enough to store folded clothing - 14" will do a lot.

On the long sides - draw a straight line across at the bottom of the slant - put stepping open shelves above and hanging underneath on the side without the window. Use double hanging for 2/3 of the length and full height hanging for the rest.

On the large window side, consider a bench under the window, as a place to sit and put on shoes and socks. Perhaps on each side of the window, a chest of drawers. Let this be the side that gives the room personality - mirrors over the bureaus.

Then, on the front wall with the charming window - consider shoe shelves underneath and on each side - these don't need to be more than 12" deep and they fit fine behind the hanging on the one wall - they just need about 16" distance between to access . .

Look online at easyclosets.com - you may want to fabricate locally, but the online design tool should work well for you. Good Luck! - it is a lovely space. Use the higher shelves for heirlooms, costumes, seasonal and specialty gear.