My OH has 2 competitions in August and needs a black showing jacket. He's quite a muscular chap and needs a 46" chest jacket. I can't find one anywhere. Nothing too expensive either as its only for 2 shows this year.
Got a big size mend black hat...have you checked ebay....I bet some of the hunting lot will have big sizes..can;t you borrow one, they'll be out of use at the mo....
Unfortunately I don't know many male riders and the ones I do know are using their jackets on the same days. Have tried ebay and fuller fillies. Thought I may be able to get away with a larger ladies jacket but he won't have it after I bought him a pair of ladies jods.
There is a place near Royston - Sandon Saddlery - that sells 2nd hand hunting gear. Its a bit of an Aladdins Cave and a bit of a bonkers shop but if you are near Hertfordshire you could try ringing them.