Black or white t-shirt enthusiast Jannik Sinner reveals his three wardrobe essentials with IG's "Street style Australia"

“For sure a nice jacket has to be there.”

That declaration signifies one of the three must-haves in Jannik Sinner's wardrobe.

Back in Melbourne, the two-time defending Australian Open champion recently dove into some fashion-driven subject matter with Olga Pokrovskaya. The Instagram creator conducts relaxed interviews in public for her account, Street style Australia (@whatpeoplewear.au).

Dressed in a black and white ensemble from Denma’s Gucci: La Famiglia collection, Sinner’s look represents the second essential from his closet.

“In my wardrobe, there are a lot of very simple t-shirts. White or black, usually, because I travel around a lot,” he said.

Rounding out his requisites, no fit would be complete without complementary footwear to top it off.

“(For) different, more serious events, I like the Gucci shoes,” he said. “A bit more elegant, it’s very nice.”

In my wardrobe, there are a lot of very simple t-shirts. White or black, usually, because I travel around a lot.

Asked by Pokrovskaya about the difference between his compatriots and Aussies when it comes to style, Sinner responded, “Italians, they go quite crazy with fashion. The haircut is for sure something that is very different.”

As for his own current length of red locks?

“I would say it’s quite international!” laughed Sinner.

The world No. 2 is bidding to capture his fifth career major at the Happy Slam. Sinner led Hugo Gaston, 6-2, 6-1, when the Frenchman retired from their first-round meeting—and next faces Australian James Duckworth Thursday evening on Rod Laver Arena.

The 24-year-old is riding a 15-match win streak at the tournament, clinching the last 13 sets he's contested.