New handmade slippers from Germany made from a vintage pattern. Made in Germany by a little old lady we met at a flea market. The material is stretchy. I would guess these would be best for a US women's shoe size 7.5 to 8.5 (maybe even one size smaller and one size larger).
Slippers (hausschuhe) are very common in Germany - you do not wear your shoes in the house. And, it is said that wearing just socks around the house will make one sick because the floor is too cold.