I think she has the best outfits in the WTA,
but the big name big name outfits are designed for 30+ moms playing club tennis.
Most 30+ moms would look silly in an outfit designed for a slim and trim hottie like Giorgi.
So, the big outfits design more conservative outfits.
(Never seen that semi-nude photo of Giorgi --- downloaded it immediately)
When cable TV first began, girls bikini beach volleyball was big and growing ---- then the players complained that they were not sex objects, and switched to baggy shirts and baggy pants.----The TV ratings dropped to zero. A couple of years later they regrouped and started playing again with even skimpier bikinis.(As in the photo above)
What surprised me was the little bikini type outfits in track and field, especially women's pole vaulting.