We were specifically told in Ibiza last year that swimskins would only be allowed (both in the aquathlon for the whole thing, and for the Middle for the swim only (middle ended up wetsuit anyway)) if they matched the GB tri suit design underneath. Such a swim skin obviously doesn’t exist.
It’s the same with rain jackets … they have to be entirely see through as GB don’t make an official one in the GB AG design available (like Spain, NZ, etc).