However, the 29-year-old star was quick to put any rumors to rest via Twitter.
"I am wearing undershorts the same color as my skin, so it gives the slits in my dress the full effect!" she wrote on Thursday.
For the last few days during the tournament, Venus has donned a bright green one-piece, with undergarmets that match her dark skin. This sparked debate online that she had elected to battle her opponents commando style.
"Please put on some decent panties. I do not watch tennis to see your exposed buttocks!" wrote one fan on her website, venuswilliams.com.
Reaction to the ensemble has been mixed, based on the posts.
"I just love her dress it has flare and it has imagination," wrote "margaret joyce." However, "Susan A. Yeck" had a different reaction.
"Your choice of outfit at a Grand slam tournament (or any tournament) was disgusting," she posted. "People really do not want to see your body parts exposed."
Although the mixed response may have come from the illusion she was naked, photos (like the one above) clearly show she was thoroughly covered. Venus indicated via Twitter that she was pleased with her choice to wear the outfit.
"My dress for the Austrailian Open has been one of my best designs ever! Its all about the slits and V-Neck," she wrote.