Family Life How do I make my boobs bigger for cosplay? How do I make my boobs bigger for cosplay? Roll up two socks tightly and stick them in your bra, beneath the underside of your breasts. This pushes your breasts up and makes them look bigger- just be careful you don't expose more than you want to, if you catch my drift. How do you make it look like you have breasts? https://www.youtube.com/watch?v=phRJvRgEbZQ