When to get a saddle fit?

I bought my first horse, Garzo, just about three months ago now. I've been using an old Wintec Pro Dressage with him, which doesn't belong to me. It's been on a "permanent loan" to me for a few years now, and I've been pretty happy using it on the horses that I've leased, but have always planned on getting a nicer saddle once I actually bought a horse.

Garzo was a little underweight and undermuscled when I got him. I've noticed lots of change in his topline since I got him, and the Wintec fits him better now than it did when I first put it on him (in fact I was just recently able to stop using the fleece pad that I originally needed to fill in the hollows by his withers) Overall, it's an OK fit for both us of, but not great.

A few other people at the barn are arranging to have a saddle fitter come out sometime in the next few weeks, and I'm wondering if it's still too early to get him fit for a saddle. I was originally thinking I would get him fit ~6 months after I got him to allow for the re-muscling, but I there's no particular reason I chose that time frame.

The saddle fitter is offering to drop the barn call fee (nearly $50) since there are several of us.

What do you guys think? Should I hold off a few more months? I think that what I want might take a while to find anyway (dressage saddle with narrow twist, knee blocks and short flaps), so maybe I should get started looking now even if he still might change a little?

Here's a "then and now" picture comparison so you can see the degree of the change so far.

Well if the saddle fitter is coming out anyway you could always have them take a look, explain that you want him to muscle up a little bit more, and see what they recommend.

Another thing is to ask about the changeable gullet systems a lot of brands have now. I know Wintec has one, and while it isn't as efficient as some I have heard good things about it. That way all you have to worry about is tree size, which shouldn't change much even if he puts on some more muscle.

Well when my horse gained weight from being a 2.. his saddle fit him much better so it's good to have them out to check the saddle fit when they change condition as you have there.