'improperly-worn' originates from the combination of 'improperly' and 'worn', where 'improperly' is derived from Latin 'improprius', meaning 'not proper', and 'worn' is the past participle of 'wear', from Old English 'werian'.

'improperly' changed from the Latin word 'improprius' and eventually became the modern English word 'improperly'. 'Worn' evolved from the Old English word 'werian', transforming into the past participle form 'worn'.

Initially, 'improperly' meant 'not proper', and 'worn' meant 'having been worn'. Together, they describe something worn in a manner that is not correct or suitable.