I used to sleep in the T-shirt I wore during the day and whatever ratty old gym shorts I could find on the floor. But one year for Christmas, someone gave me a very chic, comfortable pair of pajamas from Brooks Brothers, and I realized the error of my ways.
I stumbled upon the 3x1 shop because it's a few doors up from the 'V' magazine offices on Mercer. The store is intense: They can take your measurements, and the sewers are right there behind glass making what amounts to a couture pair of jeans.