What is Mina wearing in the first scene in Skellig?

Skellig was written by David Almond, and it is widely considered to be a Gothic story for children. Skellig is a supernatural being who is capable of working miracles. Michael and Mina are two main characters who become friends. Michael is a ten-year-old protagonist who discovers Skellig in a garage. Michael opens up to Mina about his thoughts and feelings. Mina appreciates this openness, and she also opens up, too. Both are young and discovering who they are in the world, and they both take care of Skellig.
While discovering her identity, Mina experiments with wearing different clothes, and in the first scene in Skellig, Mina is wearing an open sweater that is unbuttoned, a shirt underneath, shorts over a pair of pants, and boots for walking around. The pants are not covering her legs entirely and stop just short of the top of her boots by several inches. It is a lively and even somewhat strange outfit, but it is indicative of a young girl who is finding herself as she grows up. It represents her personality and creativity as well, as someone who is schooled at home and thinks independently.