Meanings
The placing of a feather in a hat has been a symbol of achievement that has arisen in several cultures, apparently independently. The English writer and traveller Richard Hansard recorded it in his Description of Hungary, 1599:
How to pronounce "feather in one's cap":
AU
An accomplishment; particularly one that is flaunted or boasted of.
Used other than figuratively or idiomatically: see feather, cap.