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It depends on what type of device you're recording with.
For PS3 Eye and other video cameras, you want contrast between the arms and torso. Ideally, you want a black short-sleeved t-shirt over a color long-sleeved shirt. This separates the arms from the torso and the black color minimizes the appearance of shadows cast on the torso that can potentially confuse the tracker. For pants, blue jeans are fine. For shoes, any dark shoes or color that contrasts with the floor will be fine.
As you probably guessed, loose fitting clothing makes it difficult for the tracker to see a human shape, and it can't track what it can't see. You want to clothing to be close-fitting. It doesn't need to be 'skin tight', just a reasonably good fit. This is true for either video-based or depth-based devices.
For depth scanners, like Kinect, color is not important because the RGB stream is not used at all for tracking. You might want to avoid fully black attire, however, because flat black tends 'absorb' the IR rays and not reflect it back to the device. Conversely, avoid shiny clothing that may bounce the rays unpredictably. For the most part, 'every-day' casual clothing that's not baggy and loose fitting will be fine for depth scanner devices.
In my experience, I find that when recording with Kinect devices, iPi Mocap Studio likes 'big feet' so I wear bulky sneakers or soft boots. This seems to help for better tracking accuracy with the feet.
Hope this helps.
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