Recently my mother gave me a pair of flannel pajama pants that had side seam pockets. Holy cow, I did not know I needed flannel pajama pants with side seam pockets! No wonder people wear them to Wal-Mart. But the weather was warming up, so what else to do? Make pajama shorts with side seam pockets and matching top! I haven't had matching pajamas since my last kid was born.
I found a pink bedsheet (Izod) that I had used for an awesome dress for Megan many years ago. She still mentions that dress. I still want one in my size. I also had a large piece of pink flannel I had bought even longer ago, for making diapers. Matching, without matching.
Of course, when you're using thrifted fabric, or leftovers, pattern layout can get interesting.