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Well of course a summer dress/sundress is a type of dress, but not all lolita fashion involves dresses (wa lolita with yukatas, post #152372, post #2906 and so on).

I would rather separate out buruma from bloomers since they've evolved into a separate concept from the original bloomers. Maybe we need a clothing expert? Google's giving me many options, but the most useful seems to be this which suggests "bloomers" or "drawers" for what you're thinking of.