They fit my dog really well. She is a JRT cross and has a pointy head that goes through the hole easily. If you had a squarer headed dog I'm not sure how easy it would be to get the head through.
I really liked the look of the Danish Designs 2 in 1 coat, but someone with a vizsla told me that it's quite large around the neck and their dog got their foot caught in it.
He is young very narrow Dally, he ran down the field with my Collies older design Masta coat on and came back without it, when I went to pick it up it was still done up, so no idea how he got out of it.
I thought for that reason the clips might be slightly more secure.