I don't necessarily to Yoga, but I am a huge fan of Oiselle's running clothes and a lot of their athleticwear. They have some very well thought out features.
While they're not cheap, I'm a fan of lululemon athletica because of their quality and range. I've been wearing a racerback with a sheer (breathable) long sleeve from them and their crop leggings for yoga.
I'm also a huge fan of lululemon leggings. I also wear Zella high waisted leggings which are nice to hold my tummy in while doing bending and stretching.
I was gifted a Calia cropped sweatshirt that I love. Great material. Very durable and soft. It's two years old and still looking new after several washes.