Women's 1.5mm neoprene swimsuit (Cressi Fire). Approximately two sizes smaller than my normal one. Very tight yet very comfortable to wear. Price paid: 59 euros at Sport Arena in Frankfurt.
The only bad thing is velcro straps. They are constantly trying to ruin all pantyhose around.
Also see these blog posts: 1, 2.
To view Aliexpress you might need to switch your mobile browser to the Desktop version.