New Costumes

[Ange]

Advanced Backpack

[Haazu]

Helmet of Orc Hero

[Ponpon]

Big Fish hat the one at fishing

[JoryJoe]

ToH wings and celebration wings

[Papi]

Teary eyes
Bloody angel wings
Deviruchi hats/(colored)
Deviruchi balloons
Flying Evil Wings

[Peeka~]

Sedora hat? didn't check if it was already a costume though, apologies...
Strawberry hat

[Angel Kitty]

Deviruchi Headphones
Teardrop
Green/Red Tuque
Shaving Cream (v4p)
Fashionable Glasses (in wiki's Lutia costume list but not costumable ingame)
Red/Blue Fairy Wings
Drops Beret
Love Bear Hat
Cat in Mouth/Scratching Cat
Worg in Mouth
Very Cute Doll Hat (hatter)
Stunner Shades (v4p)
Elven Warrior Crown/Headband/Circlet
Cat/Pupper version of Baby Panda
Celestial Dark Flame
Neko Mimi

[Tekkaman]

I would absolutely love Worg in Mouth as a costume, please!

[Haazu]

Elven Warrior Crown
Elven Warrior Headband
Elven Warrior Circlet

[GM-Ayu]

All suggestions above this one has been made in the db if their base hat is in the game (rather they are available is another matter)