I have a big ol noggin. 7 3/8 hat size
I spend bank when I find one that fits. Rag & Bone size large fit, but now I realize the quality doesn't match price.
It's really hard to find good hats. I have a Lola I bought at Bergdorf Goodman's in NYC. The salesperson & I went through many of the exact same hat as there were small but perceptible variations. I think that was $300 ish. If it's wool felt some stretching can be done by a real hat store.
I have a real problem with Eugenia Kim & Eric Javits who only make hats, but only one size.
I prefer in person, because fit is so, so specific.
ETA this place was recommended by a Portland forum member, but I haven't ordered from them
http://www.pinkhammillinery.com/