The @mazon link I posted has changed - they did have L and XL in both green and civil defence blue (long and short sleeve).
I bought a job lot a while back from MM when they were dirt cheap and wear them most days during the summer as workwear if I want to keep my arms covered from sun, brambles or nettles. They suddenly got a popular when Paul Kirtley started wearing them and all the sizes other than those for malnourished teenagers sold out.
Nice and comfortable and I quite like the “smock” rather than conventional button style but nothing special - fabric is no thicker or harder wearing than similar surplus shirts - I put a hole in one this afternoon just lightly catching it on a bit of machinery.
Size 41 works for me at about 16” collar.
My experience with MM has been a bit patchy - of the first four I bought, two were as new and the other two were filthy (paint, oil and god know’s what stains) and full of holes. MM don’t seem to do emails but sent replacements after a phone call. I don’t know whether they just have a few muppets in the packing and despatch dept who don’t bother checking stuff or care or whether they just send everything they have out and just wait to see if anyone complains.
My other go to workshirts also came from MM - similar style but slightly coarser and heavier cotton which I prefer - only downside is elasticated rather than button cuffs which are a bit tight. Cheap as chips but seem to be sold out at MM but might be work looking for elsewhere.
https://www.militarymart.co.uk/czech-m92-bushcraft-field-shirt/
Good luck!
