Your search for "sunday" revealed the following:
Galalith button Ø15 mm - Dark brown - 1 pc
8,00 DKK
Imitated horn button in galalith in packs of 1 pc The size is suitable for Anker's Cardigan - My Size, Anker's Jacket, Anna's Summer Cardigan, Beginner's Jacket, Carl's Cardigan, Copenhagen Cardigan, Ellen's Cardigan, Ellen's Coming Home Set, Ellen's Playset, Monday Suit, Nora's Skirt, Novice Cardigan - Mohair Edition, Novice Cardigan...
Bling button - 1 pc
35,00 DKK
Bling button suitable for Sunday Collar and Holly Bow Measurements: Diametre 20 mm Material: Metal/glass More buttons of the same size can be found here.