I made several modifications to the original pattern. See my notes below.

Cast-on
I cast on 88 stitches on 3.5 mm/US 4 needles. Two stitches less than the pattern for size 5 calls for as I preferred a 2 x 2 rib.

Neckline
10 rounds of 2 x 2 rib

Colorwork
Change to 5 mm/US 8 needles
Knit 1 round even and increase 2 stitches (K22, M1, K44, M1, K22)

According to the pattern the colorwork is done on needle size 4.5 mm/US 6, but I went up a needle size.

Body
Change to 4.5 mm/US 7 needles
I made the body 2 cm (35 cm) longer.

Hem
Change to 4.0 mm/US 6 needles
15 rounds of 2 x 2 rib

Sleeves
I found that the decreases in the pattern made the sleeves a bit too narrow at the upper arm for me. I kept 72 stitches for the first 10 rounds and then decreased two stitches every 9th round until 48 stitches (4 less than the pattern calls for) remained. I then did another 10 rounds even.

Cuff
Change to 3.5 mm/US 4 needles
20 Rounds in 2 x 2 rib