Of course parents bring their kids to the parks in their PJs.
Mom could, in theory pack them in their rolling SUV lockers, errrr strollers but that would take up valuable space from the four bottles of sunscreen, water bottles, blankets, hand sanitizers, napkins, Kleenex, two pairs of extra socks for each of the three kids, 8 sandwiches, slate formula, 12 pack of coke, rain ponchos, bag of chips, nail file, finger nail clippers, flip flops, chap stick, bug spray, spray on lotion (as a backup to the primary). Juice boxes, diapers, changing cloth, extra triple A batteries, sweatshirts, spare shorts for little Johnny. Antacids, pepto, usb chargers and umbrellas.