We're big believers in year-round tartan — and this one really is subtle and seasonless enough to wear 365 days a year. And we take fabric seriously, especially when it comes to the kinds of basics you wear every single day. Or night! Or Christmas morning! These pajamas are made from the same crisp Italian poplin that we use for our men's shirting. The construction details are the same, too — 22 stitches/inch, flat-felled seams — so they're a worthy investment. The top has a rounded collar, a button front, and three patch pockets, while the bottom has an easy elasticated waist that just pulls on.