The best replacement for covers is originals.

The best alternatives to covers are rated as following:
★★★★★  originals
★★★★  comforters
★★  cases
★★  original songs
★★  skins
★★  rims
★★  covers
★  carports
★  cushions
★  hubcaps
★  leather
★  rail ladders
★  duvet
★  throws
★  faceplates
★  solar rings
★  coverking
★  tarps
★  alumawood
★  moshi
  blue solar covers
  no covers
  awnings
  solid covers
  solid
  hub caps
  pocket diapers
  chiavari chairs
  caps
  labels
  toe covers
  duvets
  leather seats
  alloy wheels
  duvet covers
  ladders

Your alternative for covers is not listed? Suggest!
Speaking about covers, one probably shouldn't forget about sashes.

Other search terms related to covers and their ratings are:
★★★★★ sashes
★ sash
You have in mind a companion for covers and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of covers in all years. Click on graph for more.
covers
originals
comforters