I was frustrated this year while looking for a new coat for Gracie. So many that I liked did not have a slit for her harness D ring. We have a very slim silk step in harness that fits nicely under a coat but so many did not have the slit available.
I did find this one on Wag . com and it seems to be a good one. It has not arrived yet so I can't say for sure. Gracie does not like hoods but the hood is removable so I hope it works. I think the price is reasonable if the material is good.
Pet Life Fashion Parka with Removable Hood - Free Shipping