Youth Illinois Fighting illini Pajama Set Boys Sleepwear Set. This long sleeve tee and pajama pant set Illini is made of a 100% Cotton jersey knit that will your little one comfy-cozy all night long. The pants feature a repeating all over Illinois logo design and the long sleeve top features a bold Illinois Fighting illini logo. This set is made just for your little Illinois Fighting illini fan and will keep him dreaming of his Illini through the night! Go Illini!! Officially licensed Illinois Fighting illini fan gear.