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Vin is too busy making sure Zack isn't going to float in the middle of the ocean that she doesn't even notice her bikini's top is gone🤭🤭
And then the sketch of Zack being lil protective and also telling others to back off cuz she is taken by her amazing girl who is so lost in her thoughts of if they forgot to buy something at the store. 
I like to think if Vinzack were genderbend they would look a lot like butches, Zack's just a big breasted butch. Vin is small chested cuz I think eating scraps at the ages of 8- who knows how long to 14 due to being abused by the shaman would lead to him not storing much fat and with gen 0 genes, most likely the body prioritizes muscles over fat(going off without fact checking about real bodies and going on based off how i think so don't take my word for it) So I think Vin's more of muscular build and very close to her OG compared to Zack who got comfort of eating healthy her whole life, so the body def stored more fat than needed, also mommy Zack ekekekekekeke
More ideas, Vin doesn't wear bras and due to her past of being naked she has such a conflicted body image of sometimes not giving a fuck her chest is out but sometimes being shy and embarrassed. While Zack is full on shy of showing her nipples but if she's fighting, she is fighting (the toilet scene in lookism where Zack fucks up people mid shit session😭😭)
"Vin you need to wear a bra" (someone)
"Naah, let her, i like groping when there is nothing bet-" (Zack)
"AYO!!"