Arguably the biggest days in Brittney Griner's life have finally arrived -- her drug case trial in Russia has begun ... and it appears she chose to send a loud and clear message with her fashion for the monumental moment.
Cameras at a courthouse in Moscow captured Griner in the minutes before the trial officially began Friday morning ... and they showed the WNBA superstar rockin' a Jimi Hendrix T-shirt for the occasion.
While we're sure Griner is a big fan of the musician's work ... it seems the 31-year-old -- who's been detained in Russia since mid-February after authorities claimed she had hash oil in her luggage at an airport -- was attempting to send an "I'm innocent" note to the world.
You'll recall, Hendrix was arrested in Toronto back in 1969 after he, too, allegedly had drugs in his bags at an airport. Hendrix eventually stood trial in the case, but was found not guilty.
Griner -- who's facing up to 10 years behind bars if convicted on the charges -- is clearly hoping for a similar result in her drug case.
Friday's hearing reportedly lasted around two and a half hours, and is scheduled to continue next week. U.S. officials said at the courthouse following the proceedings that Griner told them she is in good spirits and "is keeping up the faith."
Griner's wife, meanwhile, spoke with CNN on Thursday night ahead of the important hearing ... and stressed she still wants to get in front of Joe Biden to make sure he knows just how important Griner is to her, her fans and America.
"He has that power -- he is the person that ultimately will make that decision for BG to come home," Cherelle Griner said. "And, so while everyone else wants to tell me they care, I would love for him to tell me he cares."
Cherelle had said earlier this week that her wife was both "struggling" and "terrified" as she awaited trial in her case.