I like both full camo and muted plaids. Fabrics that don't shine are important, as is quietness as previously stated. Keep in mind some fabrics are even more noisy when very cold. That's why I like wool in cool weather - it is always quiet. However, I have military camo that works well, and noise has not been a severe issue. Just be sure that what you wear breaks up your outline.
The only problem with my ghillies is that they are just too hot for much of the hunting season here in middle GA. But they sure do work well. Most of the time in hot weather, I wear subdued pants with a camo mesh bug suit top and only a tee shirt under to deal with heat. It was a bit shiny when new but is now old enough that this is not a problem any longer.
However, in the final analysis, if you sit still, be quiet, and work the wind, what you wear is not such a critical issue.