You will need the following stitches:
Sc: single crochet
Hdc: half double crochet
Bpdc: back post double crochet
Fpdc: front post double crochet
Sc2tog: single crochet two together
I used a size 3 crochet needle. If you increase the size of the needle, the size of the shoes will also get bigger.
The pattern (make two for a pair):
Chain 22 ch.
Round 1: 2 sc in the second stitch from the needle. 1 sc in the next 7, 2 sc in each of the next 2, 1 sc (insert a marker), 2 sc in each of the next 2, 1 sc in the next 7, 2 sc in the last. Turn with one ch (27).
Round 2: 2 sc in 1, 1 sc in each stitch until two from the marker, 2 sc in each of the two stitches leading up to the marker, 1 sc in the marker, 2 sc in the two stitches following the marker, 1 sc in each stitch until the last stitch, 2 sc in the last stitch. Turn with one ch (33).
Round 3-5: repeat round 2 and finish with 2 ch at round 5 (51).
Round 6: 1 hdc in each stitch. Turn with 2 ch.
Round 7: 1 hdc in first stitch, *1 fpdc,1hdc*, repeat *-* until the end of the round. Turn with 2 ch.
Round 8: 1 hdc in first stitch, *1 bpdc,1hdc*, repeat *-* until the end of the round. Turn with 2 ch.
Round 9-10: repeat round 7-8.
Round 11: *1 sc, 1 fpdc*, repeat *-* 7 times. **skip one stitch, 1 fpdc**, repeat **-** 12 times, repeat *-* 7 times, 1 sc in last stitch. Turn with one ch (41).
Round 12: 1 sc in the first 13 stitches, *sc2tog*, repeat *-* 3 times, 1 bpdc, repeat *-* once, 1 sc in the last 13 stitches. Cut the yarn.
The shoes is sewn together in the sole and the heel.
I found the original pattern here.