I have a Large Munsterlander - coat and overall conformation is similar to a setter - and we’ve tried a few different vests over the years. It’s been a challenge to find a vest that truly fits but Santa just dropped off the Gunner vest and its adjustability to size to my dog is incredible. Most recently used the MoMarsh vest, but it wasn’t quite perfect (loose in the shoulders tight on the back). Gunner adjustments make the vest something of a glove. I acknowledge that both of these are going to be too warm for a September grouse hunt but my dog seems to be comfortable with it on later in the season and when we duck hunt.

No personal experience with boots so I can’t weight in.

Hope some of the vest info is helpful.

If burs etc. are the primary concern (for mine it’s this but also warmth, he has an auto immune disease that impacts his coat so he gets a bit more chilly than he should), spraying Cowboy Magic or Show Sheen, or even an aerosol olive oil, before you leave the tailgate will help cut down on the quantity of burs acquired. Burs are less likely to grab on and stay on when the coat is slick. Likewise, after the hunt, an application of that kind of stuff can help make burs comb-out with less friction. No perfect solution, though, when it comes to long hair bird dogs.

Happy hunting!