feather one’s nest

In addition to the idioms beginning with feather

• feather in one’s cap, a
• feather one’s nest

also see:

• birds of a feather
• fuss and feathers
• in fine feather
• knock down with a feather
• light as a feather
• make the dust (feathers) fly
• ruffle someone’s feathers
• show the white feather
• tar and feather