Size 50 but fits like a medium - 21" pit-pit

Bit tight for me, cost an obscene amount from bk street, its a polyester mix knit so no bobbling of wool & not so much stretch in the fabric.
Has a thicker fabric detail on top of hood thats quite nice. Central Zip.
Could be classed as brand new other than trying to convince myself it fits a fair few times!
I'm open to sensible offers around the £100 mark.