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Pattern says it was #35 in Knit.1, Winter 2007 but it was only available on the knit.1 website only, not in a magazine.

Pattern description from Knit.1, Winter 2007/2008: “Cecily Glowik’s two-tone slippers in ‘Handspun Semi solids’ by Manos del Uruguay/Fairmount fibers are knit with a faux Mary Jane opening, then felted. Sew a button to the ‘strap’ after the fact.”

Notions: two 3/4” / 19mm buttons, stitch markers

Sizes
Length (before felting) 15.25 (16.25, 17.5)“/38.5 (41, 44.5)cm;
Length (after felting) 8.5 (9.5, 10.5)”/21.5 (24, 26.5)cm