So, let's say you want to copy your 1st Swimwear outfit to your Everyday category. Once you figure that out, then you would insert those numbers into this string: Then, you need to know the Target Category number (Everyday = 0), the Source Category number (Swimwear = 9) and the Source Outfit number (0 = 1st outfit, 1 = 2nd outfit, 2 = 3rd outfit etc.). First, you must be in Live mode and have your sim selected as the active sim.
It's a bit complicated and it took me a bit to understand so here are the basics for your situation. :-( However, if you're on PC or Mac and you don't mind using a cheat, then you can find detailed information about the copy outfit cheat at the below link. Note that if you're playing on console, using cheats like this will disable trophies and achievements and mods are not available. Is that correct? If so, there is not a way to do that without using a cheat or a mod. Now you want to copy each outfit and add them to your Everyday category.
Hello! To clarify, you created a bunch of new styles / outfits for your sim but they're all in the Swimwear category.