Proper Laboratory Attire is a uncommon Artifact — Equipment card from Unstable (UST), collector number 156. Current market price: $0.25 (foil $0.50), TCGplayer market prices via Scryfall.
Equipped creature gets +2/+1 and has protection from die rolls. (Nothing that lets a player roll a die can block, target, deal damage to, or attach to equipped creature.) Equip {2}