I noticed the lack of models for the protagonists of the Rune Factory series, so here's my contribution with the male playable character, Lest!
The model isn't perfect in generating Lest's admittedly complex outfit, but adding the prompts layered clothes, white cape, segmented cape may help.
For the in-game outfits, try:
pajama_attire, purple pajamas, long sleeves, collarbone, purple pants
swimsuit_attire, purple swim trunks, navel, topless male
wedding_attire, formal, suit, white jacket, long sleeves, blue ascot, black undershirt, white pants, white gloves
For the outfits he wears in the N¡nt3nd0 Dream manga, try:
gym uniform, white shirt, blue shorts
blue kagirinu, long sleeves, japanese clothes
one-piece swimsuit, frills, frilled swimsuit, yellow swimsuit
purple kimono, long sleeves, orange obi, japanese clothes, hair bow
blue yukata, long sleeves, japanese clothes
Sidenote: The generator seems to think of Lest as a woman, so adding the flat chest prompt with clothing prompts may be needed.