"Allow me to reintroduce myself ..."

That's the vibe LaMelo Ball is on right now -- 'cause the Charlotte Hornets star is finally rocking his #1 jersey after two years!!!

The hooper showed off his new threads on Friday via IG video ... putting the #1 teal and white pinstripe jersey on in the locker room with Jay-Z's "Public Service Announcement (Interlude)" playing.

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