For this first attempt I used 125 grams sock yarn left overs without caring about the colours, just to find out about the size etc.
I frogged my very first attempt as it turned out too narrow.
The result I am now rather content with was knitted like this:
Needles: 80:80 on FB and BB
Cast on for industrial ribbing (2:2 as in the Duo 80 manual page 43)
Row 1(zigzag) SS 2
Cast-on-comb with weights, no strippers
Row 2 and all following rows SS - 5.25
After cast on, continue N/N, SS 5.25
After 196 rows, hung all BB stitches onto FB, 2 rows GX/N threw off with waste yarn and cast off by hand - very loosely.
Seamed lengthwise to get a hose.