Several years ago I was gifted a turning smock from the UK turning tool retailer the Tool post. It is heavy, white denim-like material outside with an almost flannel feel inside, long sleeves with elastic at the cuff and leather on the elbows, a standing padded collar with leather for comfort and Velcro closure. Slightly longer fit overall, rear pockets and pencil pockets on the upper sleeves. Closure is a heavy zipper.
This thing has lasted ever since I got it over 13 years ago. It is heavy enough to provide warmth in the winter. It is in my regular smock rotation - a light weight Craft Supplies version for warmer weather is all but retired for the newer AAW light weight smock that sees duty about half the time, but when I need a little warmth and the protection of long sleeves (nice for roughing), this is my go to. It is shamefully stained but always good to go.
I just took a look for the tool post, but seems it may not be operating any longer. If any of you guys in the U K know where these can be sourced, let me know. I’d love to have another just in case this one ever wears out.