You can remove the writings/hovertext/tooltip either with SimPE or the
Wardrobe Wrangler.
In SimPE, you click on the resource named [text lists], and delete the writing in string box 1, or just click on the "delete" button next to the one that says "add". Then commit and save.
In WW, you delete everything inside the box where it says "Tooltip", and save the outfit.
If the outfit has writing on it (as a texture), you have to try and locate the recolor. If you're sorting everything in folders, it's easy. You can figure out which outfit recolor is behaving weird by looking at it in SimPE or WW. Some creators who include meshes by others forget to remove the bucket-fill recolors that often follows a standalone mesh. These are safe to delete.