If you choose a pair of military green camouflage pants, you can wear them with black short sleeves. This kind of collocation looks casual. Moreover, military green and black are very white colors, but the whitening effect of military green is more obvious than that of black, but the clothes of these two colors are very thin.
Black slim short sleeves suggest that you wear loose military green camouflage pants, whether it is straight camouflage pants, tooling style or something similar to casual style. Any style of trousers can be paired with pure black short sleeves. If you think short sleeves are better for drying your arms, you can wear a pair of ice silk sun protection sleeves, but I suggest you choose black ones to match your coat.