Hi-vis garments exist to be seen. Their fluorescent background and retroreflective tape have minimum areas under ANSI/ISEA 107, so a logo has to be small, placed on background material and kept clear of the tape.
The fabric is also a challenge: thin polyester or open mesh that puckers under standard density. We build the lightest file that still covers, with stabilizing underlay, so the vest stays flat and flexible.
Supplying the rest of the crew's kit? See workwear programmes for shirts, jackets and caps, and chest logo size for small-logo legibility.
We build the embroidery file; compliance of the finished garment is the decision of the garment maker and the employer. Keep logos small on garments near the class minimum.