I'm not sure who the maker is, but it's from the UK. There's a ton of hand work on this suit, but I can't find any labels or anything like that.
As for size, it's more like a 54 Regular or Long. Just tad too big for me, and I use 52L in modern Zegna, Brioni, and such. Shoulders have medium padding.
It's in absolutely mint condition, almost seems unworn.
100% wool fabric, I assume.
Functional sleeve buttons (outer two buttons are functional)
Single-pleat trousers w/ side button adjusters.
BOC Length: 32
Inseam: 29.5" + 2"
Waist: 38 (19" x 2, + 1"-2" to let out)
Leg opening: 9"