You are looking for a 'sleeveless long vest' or 'jerkin'.

Simplicity has sewing pattern you can use to modify and make a go at it.

https://www.verillas.com/bramblewood-long-vest/?gclid=EAIaIQobChMIkeyGvJju_gIV9y3UAR0xqwaQEAQYASABEgJNZvD_BwE

https://www.amazon.com/Simplicity-Sewing-Pattern-Jacket-Costume/dp/B0B255XSC3/