That image in the beginning is almost certainly fanart. xD Thores' art doesn't look like that at all, so I don't think it's trustworthy as a reference, anyways.
I love Claus' design! I mean, he's a tailor who fights with a giant needle and fabric scissors! So much love haha. <3
There's so little information on Scissors Crown... =( I swear even Bone King has more images, and the costumes in that are just school uniforms. "OTL I'll update if I come across anything else online, too.
Good luck with your costume, .(Sa).Kairi! =)
Anime North: Griselda (Odin Sphere), Maria (Shinsekai Yori)
Upcoming: Lyndis (Fire Emblem: awakening), Artwork (Nardack Illustrations), Fruit Tart (Sakizo), Ashe (League of Legends)