I guess most are down on the idea because it is seldom done well or convincingly - it's a compromise and what you typically end up with is something that is neither fish nor fowl.

There's no need to wear a jacket, but if you do it's perhaps better to wear one that's made for the job.

Whilst vintage jackets often run to smaller sizes and limit your options, ex-rental or clearing houses could be worth a look.

I have picked up a couple of decent ex-hire kilts (both from reputable kilt shops - Slanj and McCalls) and three clearance jackets, all for £50 each from kilts4less. Sure at the bigger end of the scale there is likely to be less choice but they have this (and others) in up to a size 58 https://www.kilts4less.com/product/g...ket-vest-copy/

Also maybe worth looking out for sale options. McCalls have a bunch of jackets on offer, from £75 and in some styles the sizes are listed up to 54, 56, 58 and 60. https://www.mccalls.co.uk/products/j...s/sale-jackets