Our PTO shirts say:

Once a Rebel,
Always a Rebel
New Union PTO

PS. I love our mascot is the Rebels! Lol

Our school used lanyards with a volunteer badge inside. The volunteers just returned them to the office when they finished using them.

We sold our school spirit shirts to the parents who enjoyed wearing them as much as the kids.

My husband has an apron/smock for working BINGO, much easier to wash than a poor shirt (VERY smokey).

Hats would be good too, but again, not everyone likes to wear a hat or some wear too many! HA!

Another idea might be have have smocks or aprons made in your school color with the logo that can be used/reused for events where people serve food or help others. Not for all events, but for some. I like the name tag too.

Kathy

We rely on pre-printed namebadges (3"x4") using brightly colored cardstock to identify our volunteers.

While I think the t-shirt idea is wonderful, namebadges are much cheaper and easier to add last-minute helpers to the crew.

Many of our active PTO parents buy the school T-
shirt, and we often encourage our volunteers to wear those at events. However, we have some who don't like to wear T-shirts, can't find the shirt when they need it, or are fitting a shift in between other activities and don't want to wear it or have to change clothes for where ever else they are going.

But good luck with your plan - it does sound fun!