More formal, elegant, or fancy in style of clothing; comparative form of dressy.
From 'dressy' (stylish or formal in dress) with the comparative suffix '-er,' which comes from Old English.
The fact that we have 'dressy,' 'dressier,' and 'dressiest' shows how English is obsessed with small gradations of formality—we can debate for hours whether black-tie or cocktail dress is 'dressier,' but other languages might just have one word for 'fancy.'
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