This took me 7 freaking hours...
Aqua!Raevyn!!!
From top left to bottom right we have different outfits/stages of her outfit.
First, we have her uniform when she first joined the Orville with the most sun/light protection possible with a headscarf, poncho and very dark sunglasses (and space-age sunscreen). Second, we have less dark sunglasses and freckles starting to develop. Third, Raevyn is used to light & the sun enough to take off the headscarf but she still keeps the sunglasses to protect her eyes. She can also take the poncho/cape off by now when she's on the ship, which is the fourth picture. Second to last is her regular uniform. By now, her skin has darkened and she has freckles all over her body. The last picture is the jumpsuit underneath her uniform jacket. It's made so that she can swim really well in it, exposing her gills.
As for what inspired me, the idea to have a jumpsuit with something flowy for the top came from @duxduxdux's TOS uniform redesign - check it out, it's awesome. The wrapped side comes from Kirk's green uniform. Mainly, this uses the color scheme of adjutants' uniforms on The Orville. Have some more inspo pics I found on Pinterest and Bing's image search: