I didn't have to buy shorts! here is a great pattern from the purl bee: Corinne's Thread: City Gym Shorts for All Ages
Corinne's Thread: City Gym Shorts for All Ages | The Purl Bee
Free Tutorial for City Gym Shorts - I don't wear shorts this short in public any longer, but they would be great for pj's as well.
City Gym Shorts for All Ages | Purl Soho - Create
Todd Snyder "City Gym" in NYC
City Gym Shorts for All Ages http://www.purlsoho.com/create/2014/07/24/corinnes-thread-city-gym-shorts-for-all-ages/
Olivia Palermo in Spandex Walks to The Gym in New York City - August 2016
free shorts pattern from Purl Bee - Tap the pin if you love super heroes too! Cause guess what? you will LOVE these super hero fitness shirts!
City Gym Shorts with Pom Trim (pattern on my computer)
City Gym Shorts HACK