I have a small company and I am thinking to make for all workers the custom uniform with emblem and a small pin that will decorate the coat.

Hi there. I had similar situation as yours. We were making redesign of company uniform and made decision to change the cloth label on coat on the iron enamel pins. Our company ordered many samples from different companies. The best ones were from https://www.pinmakers.com. The color on their pins is very resistant and iron is durable.