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To a tailor, preferably multiple tailors, for a quote. You've not bothered your arse to give us an area so how can we recommend a place? Slaters don't make custom stuff, so you'll have to google it. It's not like there is convenient chain of tailors you can pop in and have a chat with, it's a high-end luxury market where only the very, very skilled survive as they are the only people who can justify charging more than an off-the-rack Lambretta suit that cost £200 and fits fine for most people's needs.