Dd1 (11, y7) is growing out of the children's ranges in places where we used to shop but not quite adult sized yet. She's also starting to care about clothes a bit more and hates dresses, skirts etc. We have been invited to a wedding and she wants a jump suit or trousers and tank top over shirt with a blazer type thing. 1) would her idea work for a wedding outfit? The sort of tank tops she showed me were knitted and quite casual but maybe there's a dressier version? And 2) Where would we look for this kind of thing in small enough size? She's somewhere between child and adult in terms of body shape but most shops' teen ranges seem quite limited.
Doubt bride (my cousin) will care that much but DM/dauntie will expect her to be dressed appropriately.