When we talk about taking pictures, the background is always the main factor for shooting. if you want to get some cool and amazing pictures, you need to pay more attention on the background, only the good background could make out good pictures. this is the same rules for the zentai shooting.
In red shiny zentai, sitting under the blue sky
In blue zebra zentai, doing exercise on the grass
In black shiny suit, standing face the woods
In white lycra zentai suit, jumping in the woods when sunset
These super cool pictures, they all take the nature as their background. they don't need any photoshop software, they still could be that beautiful. so, if you want to ask me what is the best background for the zentai shooting, i am going to tell you "the nature" without any hesitate.