A set of Disney Frozen pajamas will be just perfect for your little Frozen princess. you can also get Frozen pajamas for little boys as well, which is handy as so much Frozen merchandise is aimed at young girls.
There are plenty of different styles and designs for you to choose from. Pay attention to user feedback, especially with regard to sizing.
A soft comfortable fabric - and one that can be machine washed - is ideal.
Apart from that, as long they have a Frozen theme and your little one's favorite characters on them, Frozen pajamas are sure to be well received.