When working at a Public Service Event or ARES activation, many hams wear fluorescent green vests with reflective stripes help identify you quickly as an Amateur Radio Operator, as well as providing added safety in low visibility conditions.
The ARRL has high visibility vests in their online store
Vests with customization (Such as AMATEUR Radio Communications, ARES logos, etc.) are available from a variety of sources:
You can also purchase standard safety vests used by construction crews, public safety personnel etc. and customize them to your preferences at places such as Amazon, Home Depot, Gall’s etc.
NOTE: Links to other websites are only examples and do not constitute an endorsement of that site or it’s products by Ohio District 3 ARES