Wear a barely-there mini dress, of course.
Solange (26) went for the shock factor when she walked down the red carpet at the exclusive New York premiere of Beyonce: Life Is But A Dream film last night.
The stylist and DJ showed off plenty of leg in this shorter-than-short white dress and jacket combo.
Solange teamed her dress, which looked like an oversized man's shirt, with simple, open-toe black sandals.
The fashion-conscious mum-of-one wore little make-up, opting for winged eyeliner and a slick of bright red lipstick.
Bey's little sister completed the look with plenty of studded gold jewellery and a black hard-shelled clutch.
At the same time, Beyonce (31) went for something a little more conservative in the form of a champagne jewelled Elie Saab gown.
The dress featured a sheer panel down the front which emphasised her trademark curves.
But despite all Beyonce's cleavage and bling, Solange and her killer pins managed to upstage the Halo singer in the style stakes.
It's the second time this week that Solange's bold fashion choices have made headlines.
At Sunday night's Grammy Awards she dazzled in a beaded emerald gown with thigh-high slit. She made the outfit pop with some neon orange studded court shoes, leaving Rihanna green with envy on the red carpet.
Once again she overshadowed sister Beyonce, who went for a monochrome and geometric Osman Yousefzada jumpsuit.
Solange is considered a fashion icon in the States and has featured in the pages of Vogue magazine.
For many style-savvy women, she's always been the most stylish member of the Knowles household.
And this week she seems determined to retain that title.
Beyonce's mother Tina and Oprah Winfrey also attended the event.
The documentary traces the highs and lows of Beyonce's career and chronicles her 2011 decision to no longer have her father Matthew Knowles as her manager, and the rumours that she was faking a pregnancy and wearing a prosthetic bump.