Chicago Bulls star Jimmy Butler wants to support your package ... becoming the latest NBA star to design a high-end men's underwear line ... TMZ Sports has learned.

We're told Butler -- a 2x All-Star -- inked a deal to create a signature line of drawers with underwear brand PSD -- who already have lines with ballers Kyrie Irving and Chandler Parsons.

PSD's prez, Curt Flaitz, tells us Jimmy was very hands on ... leading the design effort on all 6 pairs of undies.

"Jimmy has a great eye for what's going on in the fashion world. The line's very on-trend."

According to PSD, the line will launch in late summer 2016 ... and they'll run around $20.

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See also

Derek Jeter -- Gets Undies Offer ... We'll Support You!

Kyrie Irving -- I'm In the Underwear Biz ... Trust Me With Your Junk!

Cristiano Ronaldo -- Check Out My Taint ... In New Undie Pics

Jimmy Butler Fashion TMZ Sports

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