I'm not sure if this is readily fixable, but at Low Detail preset and low screen resolution (1024x600 in my case) I noticed the soldier equipment screen is confusing due to invisible and incomplete lines between squares in belt/holster/pack. At Medium Detail and above all the lines show up. I didn't go through each of the graphics settings to see which exact option affected this, but I assume it's something to do with texture resolutions?
See attached screenshots comparing Low and Medium detail.
Let me know if this should be reported as a Bug in the tracker.