I've had pretty good luck with my rabbitgoo harness.

https://www.amazon.com/rabbitgoo-Adjustable-Harnesses-Breathable-Reflective/dp/B07SC7WFQN

My cat is about 10 lbs and fairly short, and I got her an XS. Previously I had a PetSafe Come With Me Kitty harness from Chewy and she backed out of it on a walk when she got spooked. I haven't had the same experience with rabbitgoo.

https://www.amazon.com/Harness-Leash-Walking-Escape-Inches/dp/B07SC7WFQN/ref=zg_bs_2975254011_sccl_3/142-0229254-9067569?psc=1

the "soft" / "wrong" harness. ^

I was using this - https://www.amazon.com/dp/B07SC7WFQN/ . :(