You were banned for sockpuppetry, meaning you are banned on another account, you share an IP address with someone who is banned, or there's some other evidence suggesting you are trying evade a ban (like a similar username).
If you were banned on another account, wait for that ban to expire of ask for the ban on that account to be lowered or undone. If you know or think you might share an IP address with someone who is banned Special:Contact/general is probably the best place to discuss the issue.
Gate manga 68's English translation just came out the introductory page shows one of the female characters laying down showing her panties with the shadow of her netter regions in the material. So covered by panties, but leaving no doubt of the anatomy beneath.