You take off your summer dress to reveal a bikini:

Heechul: "AHH BULLA! What no! No man touch you no man don't touch me!" he starts frantically looking for a towel and ends up throwing himself on to you to cover your body, he then shoves you into the changing rooms and tells you that the two of you are going to eat, he also constantly tells you he can't swim and he's afraid of the water.

Leeteuk: *blushes.deeply* and stutters, trying to tell you something that you can't seem to comprehend.

Sungmin: he walks up to you and kisses you, "You look beautiful, baby. All the other eyes believe that too, maybe wear my shirt swimming" he says while handing you his shirt.

Donghae: Donghae stares like a fish out of water, by that time you're already in the water.

Kyuhyun: "YAH!" he runs up to you and tries to cover you up whilst complaining

Siwon: swiftly wraps his towel around you and asks you if you'd want to wear his shirt swimming

He sees you wearing a stitch kigurumi, getting coffee and wondering around casually:

Heechul: "Ahhh seriously! What are you wearing!" he then secretly goes off to buy one too and surprises you while wearing it.

Leeteuk: he coos over you, gushing at how cute you are, pretending he's not embarassed

Sungmin: runs up to you in his pink one and walks hand in hand with you, buying couple items together.

Donghae: He follows you around, with you on the phone and surprises you, not caring about what you're wearing.

Kyuhyun: He angrily stomps up to you, complaining why you didn't wear one from a video game instead.

Siwon: he laughs and walks up to you, asking you why you suddenly decided to do such a thing.