These fit a little bigger, probably because they are unisex.  I did not like the fact that they stretched way out just from my kids playing in them before bedtime...  We wear A LOT of MP and I am used to a very high quality standard, these did not meet that standard due to the extra stretching.  They did wash beautifully, though.  Sidenote:  I wash ALL of my Mud Pie stuff even the stuff that says hand wash only.  I have a front loader, but I do not use the gentle wash cycle.  Dozens of MP clothes have been washed here and never had a problem - they all come out beautifully.