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The author seems to be confused as to whether these are knit or crocheted, but it doesn't matter. This is a very simple design, even I could do it! And I don't see why it couldn't be used for adult slippers too. Crochet a t-shape. The size of it is as follows: given fw is the width of the foot, and fl is the length of the foot, sw is the width of the stem of the T, and sl is the length of the stem of the T, tw is the width of the top of the T, and tl is the length of the top of the T, we have the following: sw=fw sl=fl tw=fl + fw + fl tl=fw Then, when you have crocheted the T, fold the arms of the T so that they overlap the stem of the T, and sew around the three sides. It ends up with a square toe and a sort of diagonal overlap, but I think that looks rather nice.