(From the book:)

Zori are the flat Japanese sandals traditionally worn with kimonos. But these zoris aren’t for your feet at all - they’re for your wine glasses (or beer bottles). Make these useful coasters in different colors to distinguish guests’ drinks or make a set in one color as a gift to go with a nice bottle of wine If you like, leave off the “thongs” - the simple stitch pattern makes a lovely and simple square coaster on its own.