Hey Joebowler98,
If you have all the same sponsor's apparel pieces equipped and they are higher than level 4, the Set Bonus should be active. Please note that for SwingEdge gear, this adds a chance of receiving a second apparel box upon winning during a Sponsorship. The higher level all of your apparel items are, the higher the chance becomes.
If this Set Apparel Bonus is not registering in your Edit Apparel section, please reach out to Members@WorldGolfTour.com
Cheers,
Electro