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If you're skint, I'd suggest getting something cheap and 2nd hand off eBay. Old motorcycle kit that isn't especially desirable is usually pretty cheap, eg.
https://www.ebay.co.uk/itm/274215965054
Fwiw my Stylemartin were nearly new 2nd hand for <£100
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Used to do a fair amount of winter riding with plastic bags on the feet between 2 pairs of socks and newspaper stuffed up the jacket.
Definitely follow up hugo7's tip too. I picked up an incredible 2nd hand Rukka jacket which was perfect for 10 years until it finally sacrificed itself to save my skin in an accident. It was probably 15 years old when I bought it.
Also, whatever happened to fairings made out of estate agents boards, every courier in London had a winter set of those, usually on a VT500 or CB4o0.
Large in general. Although the toe is quite boxy, therefore spacious too.