'custom-made' originates from the combination of 'custom' and 'made', where 'custom' meant 'a habitual practice' and 'made' is the past participle of 'make'.

'custom' changed from the Old French word 'costume' and eventually became the modern English word 'custom'.

Initially, it meant 'made according to a customer's specifications', and this meaning has largely remained the same in modern usage.