The main prompt is "Martha". Use of a weight between ~0.7-1.0 depending on outfit.
Not all outfits are working that great, but here are the prompts if you want to try your luck.
Base Outfit:
Martha, MarthaOutfit, red thighhighs
Santa:
Martha, MarthaSanta, santa hat, christmas, fur-trimmed, apron
Swimsuit Ruler:
Martha, MarthaBikini, frilled bikini, collarbone, navel, choker, thigh strap
Aerial Drive:
Martha, MarthaMecha, mecha musume
Holy Maiden's Teaching:
Martha, MarthaWarrior
Heroic Spirit Traveling Outfit:
Martha, MarthaTravel, double bun, chinese dress