Female underwear that roughly follows the coverage of male briefs. Illustrious already knows “boyshort panties”, but it covers so many things (including longer leg variants) and is so thinly tagged the results are all over the place.

V2 Trigger: B_B_S_P
V1 Trigger: be_bo_p
Support: crotch seam (it's an existing tag!), panties, [color] waistband (not trained with, but Illustrious understands it)
Negative: wide hips (I don't know why this one needs this), bow panties, lowleg panties (ILXL and PDXL need these for panties regardless of type), seam, seamed legwear, (needed when using crotch seam), clothes writing (if it pops up, shouldn't be needed otherwise), photorealistic, photo (medium) (shouldn't be an issue, but if they are use these)
Do NOT use: boyshort panties (base understanding is all over the place so just skip it)

Made with 30 photos from clothing listings and 5 illustrated pics from charts of underwear types. While making this (and High Cut) I actually got enough pics to make models for a few other types of panties, which will come out sometime this month (as will Pony versions of this and the remaining types).

V2: Uses revised tagset from Anima version, trained with Kohya on Network Dim/Alpha at 16/8 for lower file size.