This is a classic Icelandic-style sweater, traditionally known as a lopapeysa or lopi.
Lopis are always worked in the round, so you will need circular needles, plus double-pointed needles for the sleeves. If you are comfortable using the Magic Loop technique you won’t need the DPNs. I’ve designed this lopi to be worked from the bottom up, as I think decreases are more easily hidden than increases. It also means you get to knit the most interesting bit last!

SIZING
Chest circumference:
78 (89, 98, 109, 120, 129, 140) cm
30 1/2 (35, 38 1/2, 43, 47 1/4, 50 3/4, 55) in

Body length:
61 (62, 62, 63, 64, 64, 65) cm
24 (24 1/2, 24 1/2, 25 1/4, 25 1/4, 25 1/2) in

Sleeve length 45cm/ 17 3/4in (adjustable)

This sweater is designed to fit with 6 to 8cm (2½-3¼in) positive ease.

YARN REQUIREMENTS
600 (650, 750, 850, 975, 1050, 1150) m of worsted weight yarn (MC).
657 (711, 820, 930, 1066, 1148, 1258) yds of worsted weight yarn (MC).
180m/ 197 yds or less of four contrast colours.

TO MAKE THE GREEN VERSION
Debbie Bliss Falkland Aran
(Aran; 100% wool;180m/ 197 yds per 100g/ 3.5oz skein)
4 (4, 5, 5, 6, 6, 7) skeins in Apple (MC)
1 skein each in Camel (A), Teal (B), Mustard (C) and Duck Egg (D)

TO MAKE THE FLURO VERSION:
Try Cascade 220.
You’ll need a skein or less of:
Neon Yellow 7828
Hot Pink 9469
Dusk 9614
White 8505
PLUS 4 (4, 5, 5, 6, 6, 7) skeins in Black 8555. In the smallest size you may be able to get away with three hanks, but see if your LYS will keep you a fourth just in case

Charts are given for both colourways.

TENSION
18 sts x 26 rnds to 10cm over st st using 5mm needles
18 sts x 22 rnds to 10cm over colourwork st st using 5mm needles
You should only need one needle size to get tension in both patterns as stranded colourwork tends to have a ‘squarer’ tension than normal stocking stitch.