I washed mine on cold in a top-loading machine with a regular cycle, and didn't notice any shrinkage.

Usually after I wash my shirts, I pull the hem and sleeves while it's still damp to get a little extra length, so that might help as well.

Finally snapped a picture of the new shirt yesterday 

Still love the fit on this shirt. Everything seems to fit just right. Hopefully it won't shrink when I cold wash.

I got the red flannel from last fall's 3Sixteen collection and it feels comparable in weight, maybe a little lighter. Hard to say because it has a very uneven texture.

Flat Head has done some flannels that weigh about the same as this UHF, and I'm pretty sure the super heavy houndstooth is even thicker, but I haven't bought a new FH shirt in years and I'm not sure exactly what their fabrics are like these days.

My preference is for medium-weight flannel, but I like these super heavy shirts too 

I got my shirt yesterday and I love it. I thought maybe it was going to be a little bit/loose on me, but the fit is dead on. Hopefully it's not going to shrink because this is as close to a perfect-fitting flannel as I've ever worn. I always cold wash my shirts and pull out the sleeves and length while the shirt is damp/before air drying, so I'm guessing shrinkage won't be an issue.

Anyway, this shirt is awesome. Really nice fabric. I've had Flat Head and 3Sixteen shirts that are about this same weight (I think my all-time heaviest shirt was a Flat Head houndstooth flannel from 2013, that thing was beastly) but this definitely has a different vibe to it. The Aspero cotton feels extremely nice and lives up to the hype. I do wish that this was a selvedge fabric like Flat Head uses. In practice I haven't really noticed a difference in feel and aging between my FH shirts (selvedge) and 3Sixteen (non-selvedge), but I like the little details like selvedge inside the placket and at the side gussets.

I'm used to these shirts being sewn with chainstitch construction, so the lock stitching is definitely different (though I'm guessing perhaps more durable, though I've had little issue with shirt chainstitching coming undone.) The thread appears to be polyester since it lacks the slightly puffy look and feel of cotton thread - I'm a huge advocate of cotton thread and prefer it whenever possible, but it's way less noticeable on shirts than jeans or jackets that use large, heavy gauge threads.

Also, I was surprised by the buttons - big, jacket-like snaps rather than the Universal YKK snaps I'm used to on my Flat Head shirts. I've never owned a western shirt with this type of button, which gives the flannel somewhat more of an overshirt vibe, but they seem extremely solid, so I like that. I prefer the traditional YKK style of snap for its aesthetics and feel (plus, they don't rattle.) On the other hand, with these buttons I don't have to worry about stray beard hairs snagging painfully on the top snap, which happens all the time with my Flat Head westerns.

Overall, I would say the construction and hardware gives this shirt a more utilitarian/industrial feel compared to my other flannels that have a more vintage vibe, but I like how it's a little different flavor compared to my other shirts - variety is good. I still consider Flat Head western shirts the golden standard, but given how their current shirts simply don't fit me, these are a great alternative.

Great thing about working in a cold office is that I can start wearing this shirt now! Will try to get some photos later 

[Edit] One more observation! I love the pocket placement. On many shirts, I feel the pockets are placed too high. The center of the pocket is roughly at nipple-height, which in my opinion is the perfect positioning 

Shirt looks great on you Max!

My feelings on flannel shirts have moved towards erring on the side of "slightly too big." IMO, a flannel shirt isn't supposed to be something that's super trim-fitting, and when I see people on Instagram etc. wearing really trim flannels it looks a bit weird to me now.

I'm tall and skinny and when I look back on pictures of myself wearing a Flat Head shirt in size 40 it just really accents how relatively unusual my proportions are… but wearing a 3Sixteen flannel in L (roughly corresponds to this shirt's sizing) makes me look more proportional overall.

My size sold out in less than half an hour, yikes! Glad I had already kinda decided to buy this ahead of time.

Will post some fit pictures and impressions when it gets here in a few days. I expect I'll love it and wear a ton 

After nearly ten years as a raw denim nerd/hobbyist, I've finally bought my first Iron Heart item. 

Love the design of this shirt and it's quite unlike any of my other flannels from Flat Head, 3Sixteen, RRL, etc. I purchased a size L, it will probably be a bit roomy in the chest but all the other measurements look just right and similar to my two best-fitting 3Sixteen shirts.

This is the most I've ever paid for a flannel shirt, but since pickings are pretty slim for high-quality, Japanese-made shirts that will actually fit me, I don't mind splurging every once in a while.

This fabric looks exactly like one Flat Head used on a 2013SS shirt, I used to have the Green version of that shirt.

It's a beautiful fabric/shirt! But I'm really surprised to see any FH fabric on another brand's shirt. 

Ahh yeah, I remember that tee - I did the wording for that one.