Yarn: Pingouin France +, 50% Acrylic/50% Wool (DK) in Tweedy Blue (my colour name, not theirs)
Needles: 4 mm / 6 US
Gauge: 6.5 sts and 8 rows per inch
Stitch Pattern: Twin Rib
Source: BW2, p. 4.
Comments: Zoom in on this one to see the texture more clearly - it looks quite good in real life, but it didn't photograph so well. Barbara Walker points out that this rib doesn't have a lot of stretch to it, and that it would therefore be useful for things like button bands and coat cuffs - I agree, and I think I might have an idea for where I might be able to use it! :)