Chef: Taking off the Harness

Chef is perfectly fine when I clip the harness on but is a little bothered when I unclip it. To help him through that I have my left hand preloaded with a few treats and try to feed to his mouth right as I unclip each buckle. You can see my timing is off on one of them and he swings his head to inspect the thing that moved on him. But he recovers for the last buckle.
For Chef I also had a mat by the door where I put the harness on before walks and took it off afterwards which also helped him to hold a stand for both (instead of wiggling around). The mat is a microfiber absorbent rug so it doubled as a way to wipe his wet paws when coming back inside.