DIY Altered Bathing Suits Tutorials from Plan B Anna Evers here. From basic bathing suits to a trikini (using a key ring) and an asymmetrical woven ladder suit. For a tutorial on how to change a bra to a bikini top and add bra cups to swimwear go here. But seriously, to prevent bathing suit malfunctions, I’d use a Serger. Are you brave enough to perform surgery on a bathing suit (you can go over to buzzfeed to see what other people thought)?