Tynn Line is a fingering weight yarn. I held 2 strands together to equal a Dk weight yarn.

Modifications
Sleeves
Pattern does not have any decreases in the sleeves. I added decreases to make more fitted sleeves.

My modifications are as follows.

Sleeve Decreases

1. Knit 1 round
2. Next Round decrease: K1, K2 tog, knit to 3 sts before BOR marker, ssk, k1. (2 sts decreased)
3. Knit 4 rounds
4. Knit decrease round REPEAT 3 & 4, ending up with 55 sts on needles

Bind Off for Sleeves

1. Knit 1, put this stitch back on the left needle
2. K2tbl (tbl means through the back loop)
3. Put this stitch back on the left needle Repeat steps 1, 2 and 3 until 1 stitch is left on the needle.