The straight shape of this shirt makes it easy to make, just work from a pattern or follow the instructions.

Making. You need about 60 grams of Saint-Epin merino wool, brand Au Bon Pasteur" P. F. N.. and a 4 mm diameter hook. Start at the back at the bottom.
Cast on 66 chain stitches, and make the following stitch: 1 single crochet, 1 chain stitch, pass 1 chain stitch, 1 single crochet. For the single crochet, take the two strands twisted together in front, 1 chain stitch to turn and in the following rows, make the single crochet on the chain stitch of the previous row.
Make 54 rows or 27 stripes.

Add 10 sts on each side for each sleeve. Make 16 rows or 8 stripes. Then, divide the sts in two and make 12 rows or 6 stripes, decreasing by one st per row. Then, 12 rows, increasing by one st. per row. Then, 12 rows without increasing, this for one side.
Second similar side, remove the sts of the sleeves and make 54 rows or 27
stripes.

Sew the ribbing and the small sleeves; attach buttons and straps.