There are quite a few cosmetics & runecoin items that are un-noteable making them quite annoying to use in your runecoin exchanges or sell / trade so I compiled a list please make them noteable.

Battle Mage set
Ankou Set
Mime Set
Robes of darkness (Full set including boots / gloves)
Frog Prince Set
Evil Chicken Set
Zombie Outfit
Black D'hide (G)
Red D'hide (G)
Monk Robes (G)
Monk Robes (T)
Dragon Masks (elite clue reward)
Afro
Lucky & Harry's Cutlass
Rune & Gold satchel
Ale of the gods
Giant's Boot
Crimson, Aquatic, Earthly, Gilded, Ghostly & Barrows Cavaliers
Red, Blue, Black, Green, Purple, Grey & Easter Tricorn Hats
Khazard Helm & Platebody
Flared Top
Phantom bat, penguin, cat, wolf & sheep masks
Flippers
Mudskipper hat
Bunny Ears
Gilded Cane
Fox
Explorer's Backpack
Lit bug lantern
Toy Kite
Beret Mask
Blackbeard pirate hat
Skull sceptre
Rapier
Parrot
Bucket helm & the gilded variant
A jester stick
Lava & Frozen backpacks 
Big Pirate Hat
Scythe
Silverlight
Excalibur
Pirate's Hat
Grain
Boxing Gloves (Yellow & Purple)
All the fremmenik helms (G & T)
God d'hide boots
Crab helmet & claw
Black Wizard set (T & G)
Desert Robe (T)
Robe of Elidinis
Hook and rete