There are many different ideas out there on what you should wear for Senior Pictures!
I usually tell my Seniors to "wear what you love". The perfect outfit looks like you, on your very best day. If you feel good in your outfit, you'll look like you do too. It's good to have choices, so feel free to bring more than one (or 2 or 3). You'll probably want something a little more casual, something a little dressier and maybe even something in between. If you're an athlete~bring the uniform...and don't forget the ball, glove, bat, etc. If music is your thing~bring your instrument. Show off what you're all about ~ your culture, traditions, what you love ~ this is all about you!
There are a few things that you'll want to be mindful of though. If you'll be in a nature setting, you'll want to have an outfit without a lot of pattern in it. You don't want to clash or compete with the foliage - you want to stand out against the greens. (red probably isn't the best choice either).
Think a little bit about your location choices and try to color coordinate a bit or at least try to avoid complete clashes. Generally speaking, less pattern is sometimes a better idea if you are not sure of what your locations will be like. However, if you have an outfit that you love ~ you just bring it... we'll make it work.