Knowing the background is going to be mostly yellows/browns/greens, it makes sense to wear (OPTION 1) bright colors like blues, yellows, reds, oranges, or anything that will pop.  Outfit OPTION 2 … it works to wear colors that compliment the scene… like light gray, whites, tan, or soft colors.  I do not recommend matching but it works to be in similar tones and textures.   In the end it is up to you!  Extended photography tips:  http://www.renditionstudios.com/renditionstudios.com/Photo_Shoot_Tips.html

Should you want to take this a little further… look online and take note of the “look” you like and try and emulate that.