I own both the Filson Mac Cruiser and the Double Mac jacket (two of them actually) as well as one of Teresa gfredasbell's pullovers. These are premier quality garments that will last multiple lifetimes. One of my Double Mac's is on its second generation.
I also own a Woolrich Crusier. It is nice also.
I can't directly speak of the wool on the Filson, Woolrich or Teresa's as I think their all top quality. I'm certain Filson buys a ton more than Teresa. However in her defense the wool she used seem to be of high quality, a tight weave, and the dye has not run yet in the rainstorms I've endured.
I can say her stitching isn't on the same level as Filsons. I've already had one seam blow out and the thread around the collar has already completely come undone. No biggie for me as I just re-sewed it myself. I do hand stitching all the time as I make many of my own garments and gear.
I was disappointed in that in Teresa's garment is snugger than I expected and I'm unable to layer like I had planned. Again, it isn't a huge deal for me as I'll layer over rather than layer under. The hole for the head on Teresa's is barely big enough for me to get my (go ahead and take a cheap shot here) my 5 3/4" head thru. I don't even wear a size 6 hat and the hole is very tight and part of the reason the thread blew out. Also I'm a very propositional kinda guy. My belly isn't large but about the size of my chest or slightly smaller. Yet the belly section is snug.
Now I didn't enter into this purchase lightly. I contacted mtnfolk mike off line and I got an estimate of his height/weight and we're about the same size. I am an inch shorter and 20 pounds lighter. So I order the same size pullover as he has - a medium. I called Teresa and explained my concern about the sizing. I told her I was shorter and slightly less weight than Mike and she said the shirt will be plenty big. Well, plenty big it is not. My wife says it is fine. I prefer function over fashion and I prefer very big bulky clothes to work in the woods. So keep this in perspective here.
NOW, this is no reflection on Teresa and I'm not upset in the least. Again, I manufacturer my own clothes for the wilderness. So I understand the variables and dynamics of home manufacturing clothes and I'll wear this shirt...well let's say, I'll probably be buried in it. I like it that much - warts and all!
Filson is going to have predictable sizing, stitching, and craftmanship. However with Teresa's garment you're getting a "home sewing" garment and I don't mean that as derogitory. I mean that I, myself, would rather have a hand sewn or one-person shop make my clothes. She does a nice job! Teresa will also slightly alter your order to fit you - she will size the sleeves, adjust the hem etc. She is a wonderful women and I will buy from her again.
So - it comes down to - big company, with generally consistant sizing and issues, or working with a one women shop who has excellent customer service with a one-woman shop issues. Wool quality is about the same, but I'm not an expert. I think for the price Teresa's wool garments are awesome. Whenever someone walks up to me now and looks at my shirt, they say "Filson?" and I retort, nope, Teresa. They look at me funny and shrug their shoulders and walk off. I'm wearing Teresa's pullover now and won't take it off until I return from the woods on Sunday. In fact, I'm signing off cuz I've gotta go - I"m out of here!