Never, under any circumstance is my wife (or any woman) allowed to buy clothes, shoes, accessories, etc for me! NEVER!!
First of all, many woman like to "match" colors when buying ( the tie must match the suit, or shirt or shoes etc). Too many women don't know how to work with contrast or complimentary colors when it comes to menswear, don't even mention patterns.
IMO, it's a sad state of affairs when I see a grown ass man letting his wife or gf pick out his clothes.