Rio De La Plata raglan tunic

Raglan Sleeve Tunic- top down, in the round
Basically, you can use any of the top-down raglan calculators out there. I used the Sweater Wizard software. I just slightly modified the basic crew neck raglan, as shown in the instructions below.

Size: 39"
Needles- US 9 32" circular
Gauge: 4 sts and 6.5 rows/in

Cast on 76 sts, and work flat for now
Row 1, RS: K2, pm,k1,pm, knit 14, pm,k1,pm, knit 40, pm,k1,pm, knit 14, pm,k1,pm, knit 2
Row 2, and all WS rows till collar shaping is done: purl

Row 3: Knit 1, M1, Knit 1, YO, slip marker,knit one,slip marker, YO, knit to next marker, YO, slip marker,knit one,slip marker, YO, knit to next marker, YO, slip marker,knit one,slip marker, YO, knit to next marker, YO, slip marker,knit one,slip marker, YO, Knit 1, M1, Knit 1

Row 5: Knit 1, Make 1, Knit to marker, slip marker, Knit 1, slip marker, Knit to marker, slip marker, Knit 1, slip marker, Knit to marker, slip marker, Knit 1, slip marker, Knit to marker, slip marker, Knit 1, slip marker, Knit to last stitch, m1, knit 1

Row 7: Knit 1, M1, knit to marker, YO, slip marker,knit one,slip marker, YO,knit to next marker, YO, slip marker,knit one,slip marker, YO,knit to next marker, YO, slip marker,knit one,slip marker, YO,knit to next marker, YO, slip marker,knit one,slip marker, YO, Knit to last stitch, M1, K1

Continue, alternating rows 5 and 7 as your RS rows, till you have 7 stitches before first marker.
Next RS row: CO 16 stitches, knit to next marker, YO, slip marker,knit one,slip marker, YO, knit to next marker, YO, slip marker,knit one,slip marker, YO, knit to next marker, YO, slip marker,knit one,slip marker, YO, knit to next marker, YO, slip marker,knit one,slip marker, YO, knit to end
Next row: CO 16 sts, purl (slipping markers)to last 5 stitches, work in seed stitch

Now, keeping your first and last 5 stitches in seed stitch, continue working flat, increasing at seam stitches every other RS row (every fourth row) till you have your neck as deep as you'd like. I did mine for 5". Then join to work in the round, keeping those center 10 stitches in seed for five rnds.
When you have 14 sets of increases (just count the YO eyelets going down), put your sleeve stitches on a holder, cast on 12 stitches at each armhole, and keep working your tube, adding shaping if it suits you. I wanted a loose sweater, so I had no shaping. When you get to the dsired length, work your 10 side stitches in seed for 5 rows, then divide for front and back, keeping your 5 edge stitches in seed, till vents are as long as you'd like, then work 5 rows of seed and cast off.
SLEEVES:
Pick back up the stitches on the holder (I did my sleeves two on two circular style, to make sure that they matched), pick up 12 stitches from the armhole, and begin knitting in the round. I did my decreases every 10 rounds to the elbow, then left them straight, so they would look like they flared. When I got to the wrist, I worked the center 10 stitches in seed for five rows, divided to work back and forth, keeping 5 in seed to each side, and worked another3", then worked all stitches in seed for 5 rows and bound off.

Collar-
I picked up all along the neck edge, including five stitches from the front seed stitch, and worked in seed stitch for five rows and bound off. I then worked single crochet all along the neck edge, down the plackets, and was done.