A simply Mosaic-Pattern!
The design for this pair of knee socks is done by pattern changes. The dimensioning extends to the large width, so this would be very suitable for a man.
Pick tri colours that contrast well with each other for maximum effect.
The pattern is available in English and in German. Colorwork is charted, with separate gusset chart.

Materials: each approx. 100 g 3.6 oz natural, dark blue and gray blue. (sock yarn by Atelier Zitron Trekking 6-ply Sport Trekking 75% Wool
25% Nylon (yardage 390 m/150g 427 yds/5.29 oz); Set of 5 DPN’s 3.0 mm US 3

Size: 41−47 US8.0−13.5 The length of the leg and foot are, however, relatively easy to adjust.
Gauge per 10 x 10 cm 4 x 4 in in mosaic pattern: 29 sts x 39 rows.