Squirt's Blouse is a Unique Chest Armor in Diablo IV Season 15 for All classes. It comes from Season 15 Legacy Unique; Legacy Unique: general Unique pool (permanent); General Unique loot pool / world drop - not attached to any boss loot table.
Unique power
While not taking Damage, you take up to 50% more damage and deal up to [35 - 50]%[x] more damage. This bonus is reset upon losing Life.
Affixes
+Primary Core Stat ([100 - 121])
+Life on Kill ([263 - 300])
% Resource Cost Reduction ([6.0 - 7.0]%)
+% Gold Drop Rate (guaranteed affix) ([50 - 100]%)
Where it drops
Season 15 Legacy Unique
Legacy Unique: general Unique pool (permanent)
General Unique loot pool / world drop - not attached to any boss loot table
Horadric Cube: Item Transmutation - Upgrade to Unique from a Common base of the same type
All Unique items can drop at level 1 in any Difficulty since 3.2.1 (official patch notes)
Possibly also: Uber/Lair boss ladders and Tormented bosses, Helltide chests, Whisper caches
Nightmare Dungeons, Helltide Chests, World Bosses, Kurast Undercity, Purveyor of Curiosities (Murmuring Obols)
Season 15 Legacy Unique: world drop; craftable as Charm (except Leoric's Crown/Messerschmidt's); no specific boss or activity recorded