Include pictures of the clothing in multiple colors!

For example, if you have the same short dress in red, pink, and green, you tag the different pictures

"short dress, red dress, (rest of tags)", "short dress, pink dress, (rest of tags)", "short dress green dress, (rest of tags)" in front

then, when the lora is done, you should be able to change the color using "short dress, (color) dress"

I usually include three different colors to make sure it's colorable, but only two might work!