here the list of unusual hats which i ever owned:

eerie orbit fire bucaneer's bicorne
it's a secret to everybody engineer cap
cauldron bubbles hustler's hallmark
steaming drill's hat
nuts n bolts hotrod
smoking snaggletooth
smoking big chief
cauldron bubbles charmers chapeau
bubbling tower
bubbling tossle
green confetti tyrant's helm
burning flames tossle cap
nutz n boltz cosa nostra cap
burning pyro's beanie
scorching fez
scorching nappers respite
its a secret to everybody soldier stash
peace sign pyromancer mask
planets duty rag
purple energy dead cone
hearts festivizer
bubbles attendant
burning grimm hatte
burning yellow belt
peace sign pith helmet
burning aa (my favourite hat, from all which i owned)
moon ushanka
planets brown bomber
sunbeams hallmark
scorching luchadore
sunbeams reggaelator
stormy storm milkman
stormy storm scotch bonnet
orbi. fire company man
planets executioner
hearts samur eye 69 lvl
hearts bubble pipe
haunted ghosts milkman
bubbles brainiac hairpiece
hearts killer exclusive
eerie orbiting fire team captain
cloudy moon lucky shot
searing plasma gentleman ushanka
bubbles dragonborn helmet
cloody moon surgeons stalhelm
planets beak
bubbles crocleather slouch
flaming lantern sns
planets ballcap
stormy storm ballcap
flaming lantern chieftain challenge
cloudy moon grimm hatte
flaming lantern anger
flaming lantern surgeon stalhelm
green enrgy team cap
ghosts hallmark
searing plasma milkman
hearts phantom
orbit fire kabuto
hearts flamenco
hearts swagman swatter
hearts drill hat
earie orbit fire crocleather slouch
ghosts mining light
planets samur eye
stormy nappers
hearts honcho headgear
hearts hermes
nutz n boltz kabuto
cloudy moon ze googles
hearts milkman
hearts kabuto
purple enrgy anger
smoking western wear
purple enrgy snaggletooth
smoking gonzilla
smoking billycock
bubbles honcho
blizardy storm shako
scorching bonk helmet
purple energy brigade
blizardy storm sultan
flaming lantern hermes
nutz n boltz bucaneers bicorne
vivid plasma whoopie cap
orbit fire ballcap
blizardy storm noble
green energy crown
green fetii brain bucket
blizardy storm bonk helmet
bubbles dead cone
steaming festive tree
planets dragonborn
sunbeams hetmans headpiece
ghosts stash
ghosts drill hat (2 times)
purple enrhy drill hat
steaming attednant
steaming surgeons stalhelm
green energy dappers toppers
ghosts capotain
orbit fire armored authority