A variant appears!
Variants on tees are fairly common, but on pjs sets it's less so. However, the set at the top of this page (with pants) must have done very well, because here it is released again 1 year later in 2019, as shorts and a short sleeve top. It still has the same designs and slogans "Catch ya later" and "Let's Roll", and the same colors, the only difference is the light blue pants are now light blue shorts.
Again, it's nice to see the shorts with a Sonic element.
Having Sonic on both items ties the set together, and helps it feel not generic. You could also likely mix n' match PJ sets for more fun. These all seem to be by the same company.