Sandy wears a green sleeved white top and black trousers with orange flames. Even though she has blonde hair, her natural hair color is actually red. Like all townies, Sandy's career, skills and relationships with other townies are usually randomized at the start of the game.
↑This page (in French) shows the genetic skintone, hair color, and eye color for most of the townies and NPCs in Pleasantview. (Original link is dead; link is to archived version; note that not all the information is correct which can be proven with SimPE.)