I purchased both the top and bottoms. Here is my review after using both for a few hunts.
General overview. Fishnet works for providing an additional layer of heat. Wether using Wiggys or a generic Amazon fishnet, they work. Period.
As for Wigggys stuff.
Bottoms: These are sized weird. Like they were measured off a guy that was over weight but had ankles and legs the size of a sticks. If pulled up to high, the fishnet covers the knees, making it uncomfortable when using kneepads and having to kneel down or against a tree all day. I felt no difference in heat between wearing the bottoms and not wearing them. Having felt the benefits of the top, I ended up buying some cheap unisex fishnet bottoms off Amazon for $5 for two pairs. As thin as they are they actually work and are more comfortable than Wiggys due to the softness and stretch factor. I highly recommend everyone who hunts cold weather to some fishnet bottoms off Amazon!
Top: snug fit, no stretch, strong stitching, it works!! Immediately putting on a shirt over the fishnet one can tell the difference it makes. Wiggys is right about how getting the clothing off the skin makes a world of difference. The only downsides IMO is the fishnet is very harsh/not soft. It feels like actual fishnet one would use to catch fish with. First time out with it on, I wore it on the walk in. Omg my nipples were not happy by the time I found a tree to climb. Additionally, my upper body didn’t appreciate the harsh fishnet all over. Now I just wait until I get up a tree then I take off my baselayer and put the fishnet top on, then the rest of my outter layers. I ended up ordering a fishnet top off Amazon when I ordered the bottoms to try out as well. Was Curious to see if the thickness of the fishnets makes any difference in how warm it keeps me. I’ll post an update once it shows up and I try it out.