I'm guessing you are a teacher or teaching aide. Try checking out the local thrift or second hand stores. These are good places to look for items.
Usually, if I want to make an outfit, I start with a persona. What does she do for a living, what kind of tools would she use, what is her background and education. With this information you can start thinking of what accessories she would have. Combine it with trips to the flea markets and thrift stores and you are on the way to complating your outfit.