I do this with skirts especially...a girls size 14 or 16. I am petite and it is a lot cheaper to buy a girls skirt than to shop for petite skirts in the juniors/misses/petites departments.
Pants it does not work as well with unless they are a loose fit style. After 2 children, my hips don't fit into girls clothes :-)
My dd wears some boys clothes and she does not mind at all, she just doesn't go around telling people it was from the boy's dept.
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