This wig appears to have a single blonde colour throughout the wig.
Style of wig
The wig has a central parting. The hair is straight. The length of the hair extends about 15 cm past the wig cap.
Graphics on the backing card
The doll on the front of the book cover appears to be Katie wearing her original outfit (a striped top and green hoodie).
The doll on the front of the two wig pack appears to be Sophie wearing the bright blue wig and a turquoise top and denim pants.
A similar wig in terms of the colour are the caramel with a fringe wig.