The best replacement for harness is collar.

The best alternatives to harness are rated as following:
★★★★★  collar
★★★★  leash
★★★  booster
★★★  booster seat
★★  seat belt
★★  choke collar
★★  gentle leader
★  collar dog
★  5 point harness
★  seatbelt
★  airbag
★  dog collar
  prong collar
  3 point harness
  head collar
  roman harness
  choker chain
  seat harness
  waist harness
  step in harness

Your alternative for harness is not listed? Suggest!
Speaking about harness, one probably shouldn't forget about tool belt.

Other search terms related to harness and their ratings are:
★★★★★ tool belt
★★★ ride ryte booster
★★ backpack
★★ hans
★★ 4 pole trailer connector
★★ booster
★★ stock seats
★★ bucket seat
★ rope
★ booster seat
You have in mind a companion for harness and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of harness in all years. Click on graph for more.
harness
collar
leash