No worries, it doesn't need to be my costume design for me to offer assist with other elements. Was thinking of Ariel Olivetti's work on Sub mariner when I did that, and the paste-up. If you've not seen that, you can probably get som preview pages on Comixology... or just
Google image search it.
Here are some other aquatic type CoX costumes I've done, not that they're suggestions but maybe you can swipe something here or there. In demo code format because it's shorter:
Sea Turtle (was a emp defender):
Squid Kid (water blast corrupter):
Shrimp (a claws scrapper):
Lagoon Dragoon (staff):
Toad:
Killer Carp (mace brute -- throw cat whiskers on here, recolor the orange bits grey, and you've got the variant: Mudcat):
Jurassic (yeah, this one's a stretch for aquatic, but it's reptile):