As it's a chronograph watch, I reckon some sort of sporty leather strap would suit it well. Here's a Google images link for the kind of thing I'm talking about - https://www.google.ie/search?q=rally...w=1680&bih=919. See if you can imagine something like one of those on your watch.
Shown below is a DiModell Rallye strap that I have and the quality is very nice.
Again, another DiModell Rallye strap but this time with the ivory stitching. The white-ish stitching may match the white-ish dial of your watch.