Of Troy asked...
what do you think of for the single word
flannels-- ?
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Definitely a form of trouser - usually in charcoal grey.

As for your 'jumper', I think that's probably what we wore to school as 'pinafores', and would be positively indecent without something underneath!

Another good word is 'frock' - quite commonly used amongst some of my friends, but I tried writing it in an assignment recently and my lecturer scrawled 'outdated' alongside it. Personally though, I rather like it.