Pigs have poor eye sight, but decent sense of smell; as long as their nose is not buried in the dirt, which it often is. They have very good hearing though. I'm thinking your poncho might be a plastic material which will make a lot of noise when you move around, and even more noise if you're walking through brush or past a tree. You might be hunting from a tree stand, but you could see a pig at any time. You'll want to be as quiet as possible. Think cotton outer layers and hope it doesn't rain. If it rains, well that makes for a shitty hunt altogether and you'll want to bring that poncho.

I've walked up to shotgun distances from pigs in blue jeans and a black sweatshirt. As long as you're stealthy and quiet, your earth tones should be fine.