Olive Drab vs Coyote Brown

[Noir]

Here is a real life Mini Guide: Matching Vest Color to Camo
http://www.airsoftsociety.com/forums/f96/mini-guide-matching-vest-color-camo-79314/

For experimenting with mixing patterns, consider the following diagram:

... The second distinctive shape to remove is the webbing. Many armies will issue several types of camouflage clothing but usually the soldier only gets one set of webbing, the majority of it dark green, which he must use in desert and snowfield. Making webbing brown would help, but the straps are straight lines, which the human eye is very adept at picking out. Webbing should be made from a material with a pattern of neutral grey, beige, red-brown and charcoal. To break up the shape the colours should be printed in transverse bands. The pattern used in French "Central European" camouflage may be suitable with a change of colours. The same pattern would also break up the rectangular shape of pouches and rucksacks. This pattern can be customized with white tape for snow operations, green for jungle or black for night operations. I call this "Dispruptive Webbing Pattern" (aka DWP). ...

Thats actually pretty intresting, although I suppose you could always stick stuff in your molle things too.
And for the matching camo guide I saw that before and it helped me go with cb