Video Tutorial

Round 1: Chain80 
Round 2: Hacer 80 double crochet
Rounds 3-5: *Front post double crochet, 1 back post double crochet* Repeat around
Rounds 6-11: 1 double crochet around
Separate the central part and the sleeves to make the hole for the legs
Round 12: 14 double crochet
Rounds 13-19: 14 double crochet
Place the yarn in the last space of the round 12
Round 12: 54 double crochet
Rounds 13-19: 54 double crochet
Place the yarn in the last space of the round 12
Round 12: 14 double crochet
Rounds 13-19: 14 double crochet
Round 20: 1 double crochet around, joining the 14+54+14 stitches
Rounds 21-25: 80 double crochet
Rounds 26-36: 1 decrease, double crochet to arrive at two stitches before the end, 1 decrease

Make an edge of double crochet on the back part ans the sleeves. Sew the bottom part to close the sweater