chichibukuro translates something like "clinging onto breasts" so probably an attempt at skin tight clothing?

https://danbooru.donmai.us/wiki_pages/impossible_clothes

A "breast bag" is a condition in which (for multiple possible reasons) the picture looks as if the outfit is sticking to the breasts, and "it looks as if there is a boob-shaped bag on the clothes".

Personally, I think the breasts are so beautifully shaped that it is almost as if balls are planted under the clothes.

This is the state that you will often see in stable diffusion.

I think LORA's attempt this time is to emphasize it even more.

乳袋というのは、(理由は複数考えられるが)胸に衣装が張り付いたような絵柄になってしまい、「まるで服におっぱいの形をした袋がついているようだ」という状態。

個人的には服の下にボールを仕込んでるのかというくらいきれいな形の胸がある状態。

stable diffusionではしょっちゅう見ることになるあのペタッと張り付いた状態です。

それを更に強調しようというのが今回のLORAの試みと思われます。

@phi_light I'd be honored if I could help. お役に立てれば光栄です。