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This review is from: Komar Kids Boys Toddler Superman Batman 4 Piece Pajama Set (Apparel)
The pajama is cute, and could also be used for layering, because of the material.
However, it was slightly small. I brought a 4T size for my tall just-turned-three boy, and it was a super snug fit - a little too tight.
A couple of washes later, some of the threads came out. The material is very thin, and developed some holes within a month.