Kim was keen to design something which flattered her curvy figure and paid homage to her style, reports femalefirst.co.uk.
'I love getting glam and dressed up when I go to the beach and like bikinis that fit my body type the best,' Kim said.
Kourtney - who became a mother for the first time in December - was keen to make her swimwear practical because her figure has now changed.
So the three sisters have now teamed up to launch their swim wear label- Beach Bunny Swimwear that will be available next month at beachbunnyswimwear.com.