Design a dress for the serving staff of Annadanam/Free food distribution center in one Devasthanam/Religious institute.

We are a religious institution by name of Srisaila Devasthanam, Andhra Pradesh, India. We feed daily 4000 people with an ambitious plan to scale up to 10000 people per day in the near future. We need to have a dress code for the people serving the food to the public. Cotton is preferred. Simple dress and color coding is required.