'strapless' originates from the English word 'strap' combined with the suffix '-less', where 'strap' meant 'a strip of leather or other material used to fasten or secure something' and '-less' indicates 'without'.

'strap' combined with the suffix '-less' to form the modern English word 'strapless'.

Initially, it meant 'without a strap', and this meaning has largely remained the same in modern usage.