a big girl's blouse (British & Australian, humorous) a man or a boy who behaves in a way which other men think is how a woman would behave, especially if they show they are ...

an outer garment, usually loose, that is similar to a shirt

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A shirtlike garment worn by women. It can be plain, but tends to be more highly decorated than a man's shirt, with embroidery and differing lapel shapes and sizes.