See post #3826843 for winter uniform.
When Okinami received her kai ni on March 19, 2020 (sixth of the Yuugumos to receive one), she started out with the winter version of the Kai-Ni-Yuugumo-class uniform, consisting of a short grey blazer over the dress which now has a sheer black underskirt that gradiates to green, a reference to Suzuya, with whom she had an association. Her pantyhose has also been reduced to thighhighs in the same seamed style.
See post #4645626 for summer uniform.
She later gets the standard Yuugumo-class summer uniform, consisting of a violet vest over a white short-sleeved blouse, a pleated purple skirt with a sheer black underskirt (complete with the green gradient), black gauntlet-like fingerless gloves, and the abovementioned thighhighs.
This tag implicates okinami_(kancolle) (learn more).