Bride's Gown is a uncommon Artifact — Equipment card from Innistrad: Crimson Vow (VOW), collector number 4. Current market price: $0.27 (foil $0.19), TCGplayer market prices via Scryfall.
Equipped creature gets +2/+0. It gets an additional +0/+2 and has first strike as long as an Equipment named Groom's Finery is attached to a creature you control. Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)