Bridal means to do with a bride or a wedding. Bridal gown, the bridal party, bridal shop.
It looks like bride plus -al, and it is not: the word was bride-ale, the wedding feast, and the ending is the same ale that meant a celebration. The adjective was made by mistaking the noun's ending for a suffix. Note bridle, the horse's headgear, which is a different word.
1adjectivebridalTo do with a bride or a wedding.
“She tried on dozens of dresses at the bridal shop before she found the one.”
bridal is a quality of weddings.
Old English brydealo means bride-ale, the wedding feast. The -al ending was mistaken for a suffix and an adjective grew from it.
Old English
brȳdealo — wedding ale; wedding feast
Middle English
bridale
English, today
bridal
From Middle English bridale, from Old English brȳdealo (“wedding ale; wedding feast”). The attributive usage was strengthened by association with bride + al.
Etymology from Wiktionary, CC BY-SA