After reading the reviews I ordered my two boys a size up and had to return a size smaller. My son is 9 years old and wears drainpipe trousers in most sizes and an M top, almost an L and an M sweater still suit him, but they should also fit next winter. Same story for my ordered S, which has just turned 6 and is slightly larger. We haven't tested it on a boy yet, we'll see how it holds up.
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