Take a shirt from grandpa.... cut down the sleeves and even out the bottom
and you have a Lab coat.
Borrow a tie from dad, and use a button up shirt....
find some old gloves, test tubes and some scientist glasses~
and we have a MAD SCIENTIST on our hands.
total cost of costume~ $8 (I bought new glasses~ I could have goodwill'd it for less).
a happy trick or treater~ priceless.