Upon Oyashio's second remodel/kai ni, her footwear gets replaced with rudder-heeled boots, her bangs swept changed and her black vest now has only one button. Her rigging is also updated to match Kuroshio's with the addition of a mast and reload locker for the torpedo tubes, plus her 12.7 twin gun mount now placed on a proper handgun stock. Otherwise her outfit is largely identical to her base/kai form.
This tag implicates oyashio_(kancolle) (learn more).