Model by Tenemo: https://civitai.com/models/725344/union-suits-ponyillustrious

This model was trained with SFW and NSFW photos. So it works perfectly both ways!

If you want to keep things on the prudish side (I'm not judging) Just use the tag of UNION SUIT and you should be safe, I hope.

For spicier content use the tag of PARTIALLY UNBUTTONED or ********** CLOTHES for different results.