I think the advantage you'll have is your height - I'm a few inches shorter and same clothes size but i look like SuperMario in a jumpsuit and the legs are always way too long!
Ultimately, will you be comfortable and do you like it? The thing I love about this weather is that people relax a bit and wear things they usually wear, and really no-one bats an eyelid, especially in town centres!
I live in a town with a ballet school and loads of tiny 20 somethings, but I can either spend my life indoors feeling like a heffalump, or say fuck it and try out my new outfit for the day!