Personalized Keep Calm Polka Long Sleeve Creeper. Funny novelty Polish music, German music, polka music, accordion lovers, polka band Long Sleeve Creeper - Natural and Heather with accordion graphic says KEEP CALM POLKA ON. Gifts for polka lovers, oompahpah, squeezebox players, polka bands and festivals. For chillier weather, dress baby in this soft long sleeve creeper in a great fitting 1x1 baby rib. 5.0 oz., 100% combed ringspun cotton, 1x1 baby rib. White is sewn with 100% cotton thread, Flatlock seams, Double-needle stitched rib binding on neck, shoulders, sleeves and leg openings,Reinforced three-snap closure on binding.