Absolutely not. If it were, from about 1962 until about 1975 I would have struggled to take deer. I do go the cammo route. Like a zillion others, I try to look like the surrounding stuff. During gun season, I always wear a full upper body hunter-orange vest anyway. Supposedly deer do not see colors anyway, but I sure as heck am not going to the woods in some goofy colored get up just to test it out !
I do think that wearing clothes that are in woodsy colors helps a lot. Might allow you to get away with a little movement. I would think that dark greens, browns, grays, woodsy plaids, etc. would all work great.
In my opinion, a key in not spooking close by deer is for the clothes to allow you to move with a minimum noise as much as it is to have the "perfect" cammo pattern. Wool - man made fleece - soft cotton all work great.