Pixie Undercut Hairstyle for Thin Hair. Combining two trendy elements, the pixie undercut for thin hair gives you simple, yet unique look that can surely turn heads. The pixie hairstyle can be great for thin hair since it’s very maintainable, while a short undercut can give you that extra edge you want. Short Layered Bob Haircut. This short layered bob for thin hair can give you a more sophisticated everyday look with minimum styling. This amazing hairstyle is one of the best hairstyles for thin straight hair.