Does heating already-dry clothing damage or alter them?
I'm almost completely content with the recently rearranged layout of my room, however, the metal stand/rack/shelf where I keep my frequently-worn sweaters, shirts and pants is very close to an old-fashioned radiator. I'm worried that the heat emitted
It kind of depends on how close "very close" is. If it's within a foot of the radiatior, it's not so much a matter of ruining your clothes... It's more of a fire hazard that anything else... especially if the radiator gets very hot... there
Metal Shelving. 
Metal Shelves
metal shelving and storage 
It is very sturdy and yet lightweight enough to move around easily.