This cozy sweater is worked in double crochet from side to side.
 
Materials: 2 (2, 2) balls of Noro Tsubame (#4CYC) 656 yards, [600m], 50% Silk 25% Wool, 25% Polyamide.
Hook: H [5mm], 1 Yarn bent tip needle, Closing markers.
Gauge: 14 Double crochets and 7 rows = 4 inches, [10 cm]
Sizing: 36 – 40 (44 – 52, 56 – 64) inches, [ 91.5 – 101.5 (111.75 – 386, 142 – 162.5) mm]
Stitches and techniques: Chain (ch), Double Crochet (dc), Make a Double Crochet (mdc), Running seam stitch.
Making a DC at the end of a row:
With working yarn, y/o like you are making a dc, insert into same stitch as last dc. Pull through only 1. (New chain made)
Make the DC: y/o again and insert into chain you just made, pull through 2, y/o, pull through 2. 
Notes:
This sweater is a quick and very easy crochet pattern. It took me 3 days to make the pieces. I used Noro Tsubame for this one as I wanted to have a no think color changing project. It only takes 2 balls, but every bit of them for the largest size. Larger sizes can be achieved by wet blocking and pinning.