This pattern is featured in the book Knit a Little by Marie Greene.

If you’re looking for a quick foray into colorwork, I have just the thing for you. Boathouse offers an easy canvas for color exploration; just enough to keep things interesting, without being fiddly. The little colorwork “buoys” will shine in bright contrasts, subtle gradients and everything in between.

Even if you’re a colorwork regular, pay special attention to your floats to keep them loose and even on the back side; your colorwork gauge should be the same as your stockinette stitch gauge.

See the grown-up version here: https://www.oliveknits.com/product/boathouse-pullover/

Yarn
Worsted weight | Berroco Ultra Wool | 100% superwash merino wool | 219 yards/ 200 meters in 100 g
MC (Cream) 280 (310, 320, 450, 520, 700, 730) yards/ 256 (283, 293, 411, 475, 640, 667) meters
CC1 (Dark aqua) 50 (60, 65, 70, 75, 80, 85) yards, 46 (55, 59, 64, 69, 73, 78) meters
CC2 (Light aqua) 50 (60, 65, 70, 75, 80, 85) yards, 46 (55, 59, 64, 69, 73, 78) meters

Sizes
1 (2, 3, 4, 5, 6, 7)
0-6 mo (6-12 mo, 1- 2 yrs, 2 -4 yrs, 4-6 yrs, 6- 8 yrs, 8-10 yrs)

Finished Measurements
Chest circumference: 19 (21, 22.5, 24.5, 26.5, 29, 31) in/47.5 (52.5, 56.25, 61.25, 66.25, 72.5, 77.5) cm
Length of lower body from underarm: 6 (6.5, 7, 8.5, 10, 12, 14) in/15 (16.25, 17.5, 21.25, 25, 30, 35) cm
Sleeve length: 6.5 (7.5, 8.5, 10.5, 12, 13, 14) in/16.5(19, 21.5, 26.5, 30.5, 33, 35.5) cm
Sleeve Circumference: 6.9 (7.6, 7.6, 8.4, 8.7, 9.1, 10.2) in/18 (19, 20, 21, 22, 24, 26) cm
Yoke depth (measured from under the ribbing to the underarm): 5.2 (5.5, 5.8, 6.2, 6.5, 7.1, 7.4) in/13 (13.75, 14.5, 15.5, 16.25, 17.75, 18.5) cm

Needles
US Size 5/3.75mm (16-24 in/40-60 cm) circular needle – yoke and body (use length that is most comfortable for the size you’re knitting, transition to a longer length as needed)
US Size 5/3.75mm (12 in/30 cm circular needles or DPNs) – sleeves
US Size 4/3.5 mm (12-16 in/30-40 cm) circular needle – neckline
US Size 4/3.5mm (16-24 in/30-60cm) circular needle – bottom ribbing
US Size 4/3.5mm (DPNs) – sleeve cuffs

Use needle size necessary to achieve gauge. Adjust other needle sizes accordingly.

Gauge
20 st and 26 rows in 4 in/10 cm in stockinette stitch with largest needle, blocked
Use all three yarn colors in your swatch - and wet block it before you begin - to check for possible color transfer.

Notions
Darning needle to weave ends
Stitch markers
Waste yarn or stitch holder (for sleeve stitches)