I really liked this bra in the past when I wore a size large.  I needed more because I have lost 60 pounds since the birth of my daughter.  A couple weeks before I bought this one, I was sized by a lactation specialist at my nearby hospital and we both came up with size L for me, so I am sure that is my size.  The one I bought there was falling apart after one week of use and before I knew it, this 2nd one was already ordered.  I am so dissapointed because I have worn XL in the past and had bras with this child and the first child last for 6-12 months or longer, still intact and in the past I bought new ones, more because they were faded and stretched out or too small, not because THE ELASTIC THREADS WERE BREAKING THE FIRST WEEK OF USE, as these last two.  I was really hopefully that the one I had from the hospital was just a fluke or from a bad batch. These are so comfortable (especially for my sensitive skin,etc.) and convenient for nursing, and possibly the size XL is made with a bigger band to hold up better, but for me, not I have to figure something else out :(  I will still stay loyal to Medela's regular daytime nursing bra, but I am really disappointed in the sleep bra now.  I would return them now, but I would have nothing to use till I find a back up.  I would really like to see Medela step up and make this better, esp. with being such a well respected company.  I would gladly pay more (as I do for the daytime bra) for the same bra if it lasted for a few months.