'mistakenly-worn' originates from the combination of 'mistakenly' and 'worn'. 'Mistakenly' comes from 'mistake', which originates from Old Norse 'mistaka', meaning 'to take in error'. 'Worn' is the past participle of 'wear', which comes from Old English 'werian', meaning 'to clothe'.

'mistakenly' evolved from the Old Norse 'mistaka' and 'worn' from Old English 'werian', eventually forming the modern English compound adjective 'mistakenly-worn'.

Initially, 'mistakenly' meant 'in error', and 'worn' meant 'clothed'. Together, they describe something worn incorrectly.