What's the max DT without wearing armor in Fallout New Vegas?

This list does not account for damage resistance, only damage threshold

Perks:
Toughness (2 ranks) +3DT per rank
Stonewall +5DT against melee and unarmed
Nerd Rage! +15DT when health is less than 20%
Hit the Deck! +25DT against explosives
Whiskey Rose +2DT when drinking whiskey

Consumables:
Whiskey (with Whiskey Rose) +2DT (4min*)
Datura hide (Honest hearts DLC) +1DT (1 min)

Clothing:
Dr. Mobius' Scrubs (Old World Blues DLC) +6DT
Bounty Hunter duster +6DT

Based off of this, the absolute highest DT you can have is 55DT; 2 ranks of Toughness, bonus DT from Nerd Rage!, having recently consumed whisky and Datura hide +3DT, wearing either of the apparel listed for 6DT and fighting an enemy who uses explosives for a bonus 25DT

*Whisky rose effect length is not explicitly listed, but other Whiskey effects last for 4 minutes, this one probably does too.