Bridal

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late Middle English: from Old English brȳd-ealu ‘wedding feast’, from brȳd ‘bride’ + ealu ‘ale-drinking’. Since the late 16th century, the word has been associated with adjectives ending in -al.

wiktionary

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From Middle English bridale, from Old English brȳdealo(“wedding ale; wedding feast”); synchronically analyzable as bride +‎ ale. The attributive usage was strengthened by association with bride +‎ -al.

etymonline

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bridal (adj.)

"belonging to a bride or a wedding," c. 1200, transferred use of noun bridal "wedding feast," Old English brydealo "marriage feast," from bryd ealu, literally "bride ale" (see bride + ale); the second element later was confused with suffix -al (1), especially after c. 1600. Bridal-suite is from 1857.