One thing I always kinda liked about Amy/the costume department that dressed her was that she tended to have particular clothes she kept coming back to. (Accessories, too – not pictured here: her red scarf and the little A necklace she wears in almost every episode.)
I know, I know, it’s probably more a case of reusing clothes that’d already been bought rather than a concious character decision or anything, but I still like it.