Unfair Contract Terms vs Reasonable Expectations

Kavita ordered a custom-made lehenga online from a boutique for her sister's wedding. The website had 'best quality' and '100% satisfaction guarantee' written in bold. However, when the lehenga arrived, it was of poor quality and didn't match the website pictures. Kavita tried to return it, but the boutique refused, saying it's 'as per design'. The contract didn't explicitly state what 'best quality' means.

What legal remedy would apply in Kavita's case, under Contract Law, if she files a complaint against the boutique?