Okay, if you make a new project, right click on the gray space on the left and add a new model, then type in "Sp3" (dont pick the ones that end in IK) and double click the one that looks like a Inkling or Octoling in the right box.
And if you do it again, but look for the ones that go btm, HG, or CLT, you can drag the name onto the one with the name of the Inklings or octoling model, and drag the "zero" all the way to the right, the clothes will go RIGHT on the model