Sorry I missed this one earlier. I have a DVD titled D-Day in Color, a very cool disc that entails not only color footage of the invasion but stock footage of Britain itself, the training operations, fighter ops, and more. I have several DVDs of color footage in WWII.
Now to your question. The uniforms in the DVD look mostly regular issue drab green. That is the shirts and the pants are green. The jackets/overcoats are khaki. You can see very clearly that the jacket is a completely different color than the pants. The shoes are a dark brown and the covering, what ever you call the piece of uniform that covers the top of the boot and the bottom portion of the leg is khaki. Most of the backpacks and other accessories are khaki.
The commentary portion of this particular DVD states that the reason why there is so little color film of D-Day is that there were, based on some estimates, fewer than twenty color cameras rolling on June 6th. When the photographers got to the beach, the fighting was so fierce, that most of them stopped being photographers for the moment and they simply had to save their own lives. There is actually very little film, b/w or color, at all of D-Day due to the limitations of the day. The water, the beach, the sand, the fight itself took its toll on cameras and the camera operators.
There is an extraordinary piece of added commentary about the Pathfinders, the troops who were dropped from C-47s behind enemy lines to lead the way for the invasion. There is remarkable color footage of the plane, tail number 293098, that was the first plane in the air that night. The invasion stripes appear to be still wet from application. Parts of the plane are still masked off where the stripes are painted. And the stripes themselves are rather shabby. Brushed on, unven edges, and for the most part, looking like the job was done in haste.