Rarely does one come across something and actually wonder how one lived without it--this Simple Wishes Hands-Free Pumping Bustier for Medela is one.
Not only is this going to be something I recommend to other people, but the bustier is going to be the one item I will always buy for every baby shower when I know the expecting mother will be pumping.  I purchased this for pumping for my second child, after pumping until the first kid was 13 mos old. I was tired of breaking rubber bands so I could pump hands-free.
I regret not having found the bustier before now.  It has made a world of difference in the comfort and ease with which I pump (now twice per day with a Medela PIS).
The cotton is comfortable, and the bustier is quite sturdy.  The horns are held snugly in place, and it's easy to take off and put on, using a zipper.  The bustier has a back piece that is velcro, which is left in the position you need, while the zippers let you take it off and on quickly.  I use it only when pumping, though it seems possible to wear it as a regular bra.
I'm a larger mom, but I got the s/m size, and it works just fine.  If you're ordering it, sizing is large, since the velcro can adjust for losing those baby pounds and changing sizes postpartum.
I really can't say how much I love this bustier, and if you're hesitating or considering it an unnecessary purchase, it seems crucial once you've used it.  It also seems to be something that can work well for almost everyone.  I also recommend it as a shower/new parent gift, because it's not something most people would think about purchasing but will quickly become a favorite item.