Hello Kitty Flannel Pajama Pants

Walmart - Seller

Exact Hello Kitty brand match, Identical all-over Hello Kitty face pattern, Matching pink base color, Matching white Hello Kitty faces with pink bows, Material appears to be soft flannel, consistent with the source, Product type (pajama pants) matches, Price tier is consistent

Sanrio Women's Print Pajama Pants

eBay

Hello Kitty brand present, Matching pink base color, Similar Hello Kitty face pattern, Pajama pants category

Hello Kitty Velour Sleep Pants

Walmart

Hello Kitty brand present, Pink color, Pajama pants category