
I really don't understand, as harnesses are not designed to be left on the dog so you would have to take them off after each walk anyway. So you just put on their sweater then the harness.
Also you should teach them to stand or sit qyietly while you get them ready for a walk. It is quite easy.
My first dog used to get herself wound up to fever pitch, and I then taught her to sit quietly on the step in my hall to have her olead attached. I did this by stopping getting the lead on until she was quiet and settled. No matter how much she jumped and barked I would not oput the lead on until she stopped. Iniatially this meant I would go and sit back down in the living room. She soon worked out that if she was quiet she got her walk, if not then no walk.
With my Elkhounds I did the same. I now have five aged 12 down to 4 months. they all now line up and wait quietly on the step before leads arte put on. On occasion one of them may start to get excited, but they are ignored until quiet, while the others look at them with disgust, ande they too settle and lead goes on. Very importantly I have taught them to sit and wait once I open the front door. I then walk through and call them out behind me (about the length of their leads). Walking 90 plus kilo of dogs takes a little organising and discipline :D :D