All being said and done, wearing of full sized medals on civilian clothes is allowable. In reality, no one in the US wears full sized medals anywhere out of formal service uniform like the British do. If anything is displayed, miniature enameled medals are worn on the lapel.
Kerry, the attention whore, is one sad assed clown show and I think he is campaigning for the 2024 nomination by doing this.
it will be a long list, Biden's not running.