The topic of dressing up on Purim has been discussed on the forum, but I am looking specifically for early sources that mention the custom.
Please include specific sources - direct links are preferred.
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It's not mentioned in the Gemara/Midrash/Geonim. The earliest source seems to be a teshuva of the Mahari Minz by the 15th century. This is referenced in the Rema OC 696:8. It's a fairly new custom, not obligatory and not everyone does it