I think custom apparel should be able to cover up to 100% of the wolf rather than 80%- specifically if the original wolf lines/shading remains intact. I'm not sure why fullbody skins should be disallowed.
I also feel people should be allowed to make markings that are very close to pre-existing marks on site in some cases. Specifically in the case of extremely simplistic concepts- like underbellies, or coloured paws/ears. These concepts are not unique enough to disallow- inevitably people will make things that resemble the site's markings- it's impossible not to when what you're creating is something as generic as an underbelly.