For a general Yoga class, the only equipment you need is a non-slip yoga mat and maybe a blanket that can be folded over a few times to provide support for seated postures as well as to keep you warm during relaxation.
For Pregnancy Yoga you may also want to bring a pillow or two with you to make sure you are super comfortable when sitting or lying down on your mat.
If you have any mobility restrictions that prevent you from sitting comfortably on the floor or from getting up and down from the floor, consider joining a chair Yoga class, you will be able to enjoy some gentle posture work as well as work with breathing and meditation techniques as we do in our general class.
You should wear loose, comfortable clothing that allows you to stretch and move freely. Posture work in Yoga is traditionally practiced barefoot, however you can wear socks if you wish.