The top button of a dress shirt or else blouse, also occasionally referred to as the neckline button, hold the collar of the top together. It is worn also open or closed, that depends on the event, the fashion of clothes being worn and the wearer's first choice. Most choose to have the top button open for better comfort.
More men when compared to women wear shirts with the top push button fastened. In particular, the top button is fixed firmly when worn with a tie. Having this knob done up is a much broken part of numerous school uniforms.
In the Second World War a custom amongst qualified RAF combatant pilots was to leave the top knob of their uniform undone, in flouting of uniform rules, both in an effort to stay cool in the cockpit, and to highlight their distinctive image as the best group. Nowadays, wearing the top button of Matthewaperry Suits in a casual atmosphere is a teen taboo.
While mainly women prefer to have the top button unlock for better comfort, some blouse made for women have looser neckline so the top button can be fixed firmly with no compromising comfort, but giving the similar stylish look.