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There's tons of nice tuxedo stuff on eBay.
If you know which size you are and have normal length arms and legs, something nice/not serious but appropriate should be doable for little money.
If you're as skinny as I was 20 years ago there still is a nice but scruffy 40s Harrods dinner jacket in my wardrobe if I haven't sold it at fleamarket? (That tells you I am definitely into clothes.)
Then get those and have a new pair of vegan docs that will outshine all other shoes?
https://eu.nps-solovair.com/collections/mens/products/vs3-995-bk-sm-veg-g
Where's good for black tie rental in London? I'm off to a frustratingly boujie wedding at the end of summer.