Low contrast is the bomb. When done well tonal outfits are generally easy on the eyes. I agree that it's difficult but would hesitate to say it looks contrived. It seems more incidental.
Matching colors is also easy on the eyes, but because it obviously requires thought it stands out as looking more contrived.
Thanks for sharing the photos @Mr. Six. Looks awesome made up.
@dieworkwear I thought you meant patch with flaps, which I prefer over just flapped pockets. That way you can either remove the flaps and still have patch pockets.