flaunt (someone's) feathers

Translations
выставлять напоказ (чьи-то) перья
He loves to flaunt his feathers at social gatherings.
Он любит выставлять напоказ свои перья на светских встречах.
Definitions
To show off or display one's abilities, achievements, or possessions in a proud or ostentatious manner, often to attract attention or admiration from others. The phrase draws on the image of a bird displaying its colorful feathers to impress others.