The yellow should not cause you a problem provided:
–you light the green screen evenly across
–you place talent far enough in front of the screen that there is no contamination — no green edges on the yellow clothes or on anything else — you can help yourself here by blacking off all the green screen that isn’t directly behind the talent, and in post fill in that black with matching green (“garbage mat”)
–you control the light on the yellow clothes so they are not too hot in relation to the skin and the green screen; some yellows can be pretty vivid
–you do not put a hot rim light on your talent — a light back-light and possibly equally light side kickers work best for compositing. You might get away with a little warmth on the back/side lights to counter any green spill, but if you see the color, it’s too much
All of the above holds true, no matter what the color of the clothes.
Rick Wise
director of photography
Oakland, CA
http://www.RickWiseDP.com
email: Rick@RickWiseDP.com