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Breathing certainly gets priority, but a suit that's too big will do little for protection from the cold.
If a person really needs a suit that's notably too big on one half of their bodies due to their specific body shape, they should really consider a custom suit. (This may matter less if you're fortunate enough to dive only in warm water needing 3mm or less, but in cooler water, you'll not likely be happy with a suit that's too big, top or bottom.)
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