Since a lot of you guys been asking, I made a short tutorial for binding chest^0^
Its name is 'muscle tape' or 'taping tape' :3
You can find it on google easily~
And this is the way
sorry for the sloppy drawing hahaha
start from the front, and push it to make your chest as flat as you can!!
Then you're ready!!
You can cosplay like this now!
Of course you should erase the borders to make look better:3