Garment bags

After visiting the local thrift stores for the past two years, I have accumulated a wealth of great coats, sweaters and other high end clothing I would like to take care of. I have far too many items for the space available and would like to know the best solution for storing some of these valuable jewels before the moths and black mold takes hold. The topic of garment bags comes up quite frequently when doing a search on the Internet but I would like a more professional opinion on how to properly store these items while the culling process begins to remove the less valuable bits of clothing.

Keeping shirt cuff length at 3/4" under the coat sleeve consistant.

I was wondering how to keep my coat sleeve from riding up my arm exposing more of my shirt sleeve or at times covering the shirt sleeve completely on one arm and showing 4 inches on the other arm. There are times when I have my arms full of items and I cannot pull my coat sleeve down to cover my shirt sleeve. A small inconvenience but one that I was curious about how others handle the professional look of showing only a small part of the shirt sleeve.