I really need 8 basic buttons -- 2

I really need 8 buttons with four holes, 18mm they need to be a purple grey, blue colour. Very basic. They need to have a thin rim and slightly curved as in rounded in the middle and have a gloss finish. Something that can go through the washing machine no problems. I’ve tried to find these buttons that are very basic but are near impossible to find. (Surprisingly) I’m trying to replicate a 1890s -1900s blanket robe from Disneys The Chronicles of Narnia: The Lion the Witch and the Wardrobe 2005. Edmunds robe he wears when he enters Narnia. This is my dream robe and I’ve spent too much money on buttons that are close but either too small or only two holes so I drilled in extra and it’s been a nightmare. Here are some reference images. I thought I found the perfect buttons on the last image but they come in a size too small (14.7mm) and aren’t as glossy as they should be. If you need too, you can watch clips of this scene to see the gloss. Really need them to be replicas.