'accidentally-worn' originates from the combination of 'accidentally' and 'worn', where 'accidentally' is derived from Latin 'accidentalis', meaning 'happening by chance', and 'worn' is the past participle of 'wear', from Old English 'werian'.

'accidentally' evolved from the Latin 'accidentalis' through Old French 'accidental', and 'worn' from Old English 'werian', eventually forming the modern English term 'accidentally-worn'.

Initially, 'accidentally' meant 'by chance', and 'worn' meant 'having been put on', which together evolved to describe something put on by mistake.