上草履

上草履 = uwazouri = slippers (for indoor)

しまいには上草履（うわぞうり）を穿（は）いて広い廊下をあちこち散歩し始めた。
Shimaini wa uwazouri o haite hiroi rouka o achikochi sanposhi hajimeta.

Finally putting on the slippers, (she) started strolling up and down the wide corridor.