Patches aren't limited to uniforms — plenty of brands use them as a physical extension of their logo on merchandise, packaging inserts, and staff gear.
A limited-run patch tied to an event or launch tends to get kept and displayed rather than thrown away, which makes it a strong low-cost marketing object.
Consistent placement across a team's gear (same patch, same spot) reads as more professional than a logo dropped wherever there's space.
For a first order, a single well-designed embroidered or PVC patch usually outperforms a wider but thinner product line.