Hey guise, british graphic design student here.

For Sixth Form I'm going for the cockney market staller look with a suit, burberry mac and some decent charity shop brogues. But the trousers of my suit make the outfit laughable. Is there any way I can go to a tailors and ask for the trousers of my suit to be made slim-fit/skinny without ruining the suit? My budget is about £50 and the suit is worth £300. It's a rare colour and wool blend meaning buying a new pair would be pricey and difficult. There are a few small time tailors around my area, buuut I don't know what to ask for.

Help pls, /fa/

Pic related; it's kinda the look I'm going for, but a bit more masculine.