I was been asked about this question ever since i start wearing a zentai suit. The answer is quite simple :
1.take the suit off .
2.add a crotch zipper on the suit when order it.
A crotch zipper can be made Vertical or Horizontal.
The Crotch zipper (vertical) can be made for male or female. The only difference is the length. The male crotch zipper start from under belly button to the middle of the crotch. The female crotch zipper is longer, start from under belly button to the under back waist.
As the zipper is invisible, so you do not have to worry about how obvious it is. This custom option will brings you a better experience in a Morph Suit or Zentai Suit.
As you can see, there is a 3rd design – Wear From Legs – with this design, there will be no back zipper on the suit.
The 3 custom options are can be made on : http://www.zentai-zentai.com . The price for each option is : $5.00.