I have a 5mm suit and a 7mm suit. I have low body fat and feel the cold when the water temps drop. The 5mm was worn during the summer until early November last year, 7mm during the colder water temp months.
The 5mm is an Omer Blackmoon (same as Camu 3D) - would I recommend it? Yes. Mine has the high waist trousers and compared to my 7mm which has long johns, a small amount of water does up go up the back at times.
However, I now use a thin neoprene undervest (Mares) when wearing the high waist trousers - it stops any water from getting down my back. When walking to a venue, to avoid overheating, I can wear the trousers and undervest and put the top on when I am at the get in point. Also, I don't like pissing in a wetsuit and the high waist trousers mean I can go onshore and do one easily.
My 7mm Mares instinct is a great suit but it's easy to overheat in it when out of the water and the long john trousers means it's more restrictive.
I would have thought that most of the Italian dedicated spearfishing wetsuits would be suitable as long as the fit is ok.