A note about Target yoga pants (I work for corporate, and used to be in the apparel department):
There are two lines of C9 yoga clothes -- one of them is called "Premium" and it is a higher end stretch fabric with high tech qualities. Personally I LIVE in these, but the first 20 minutes after you put them on, they ARE tighter in the tummy area. They are also slightly more expensive. however, since they are a hgih-tech fabric, they might be great for your wound in terms of wicking away moisture, etc.
The premium line has a silver hangtag.
The other pants are looser.
I found a pair of yoga pants at Motherhood maternity for cheap -- I actually don't care for them because they are so loose in the tummy area, but for purposes of babying your incision, they might be perfect.
I agree that $20 is super cheap / reasonable for yoga pants!