Slim & petite is kind of the whole vibe here — Brownskin, 5'4, 23. Which, okay, “slim” and “petite” can sound similar, but to me it reads as small-frame and clean proportions, not just a size tag.
I don’t overthink the fit; if you’re after slim & petite, that’s what’s being described, 5'4 at 23. Cool. Keep it simple—Brownskin, slim & petite, 5'4, 23.

