Okay; if I'm understanding your questions correctly...
The rules will remain the same as they have been regarding content. "Sexy poses" are fine, provided the images are not NSFW (nude, anything exposed through clothing, fully clothed but surrounded by nude characters, etc.). Swimsuits are fine if, once again, nothing explicit is exposed. Also, regarding 'lolibaba'; NSFW images depicting or appearing to depict underage characters are not allowed on EcchiDreams. If I recall correctly, 'lolibaba' is someone who, legally, is old enough, but looks-wise, has the appearance of a child (example: Etna from Disgaea), which means NSFW of those characters is not allowed. We also do not allow NSFW images that would be fine to be used for characters who are intended to be underage.
There's no 'leeway for interpretation' I see here? A pair of panties or swimsuit that nobody is wearing would count as purely clothing/accessories, which would mean that you wouldn't be able to post it to EcchiDreams. But nothing stops you from posting the swimsuit or underwear to a different site, and linking to it on EcchiDreams, provided it doesn't break any rules - which, if it were just a swimsuit with nobody wearing it, it would not - and saying "this is an example of what my character may wear".