These are pajama pants from the Australian brand Peter Alexander. They're similar to Gelato Pique in Japan. They're made of a fabric similar to Uniqlo's Relaco pants, so they're light and comfortable to wear. I bought them as a souvenir when I went on a trip, but they're still unused. They're a collaboration item with Bluey, an Australian character. The retail price is $70. The size is S, but I think they would fit a slim man or a woman who usually wears size M to L. The waist can be adjusted with a drawstring. Thank you.