The widow's bites in Civil War look pretty simple to make, if you don't need them to light up. There's a pretty good side view of them in trailer 2 in the scene where she's running at the airport. Bill Doran's Youtube channel shows how you can cut details like that from thick foam. The foam would probably then need to be sealed and covered with something like Plastidip.
I have made two versions of the widow's bites from Avengers. The first one is fully documented in my blog and the "pods" on the bracer are made from heat shrink tube. There's a bit of electronics & Arduino code as well and a hidden button inside each glove to control the light show. The second version is identical except that the pods are 3D-printed, I used white LEDs instead of blue (not 100% sure it was the better choice tbh) and a 3.3V processor instead of 5V.
Here's a link to the first part of the widow's bite blog series:
http://blog.poista.net/2016/01/17/black-widow-part-6-biting-the-bullets/
As far as the suit goes, the materials used in Civil War are clearly visible in high detail in a trailer 2 shot where you see her shoulder. They clearly used large plastic zipper coils on some of the seams. Bad news if you are using a pattern designed to stretch (like the Yaya Han bodysuit pattern). That shot shows two different fabrics: one with a hex pattern (potentially screen-printed) and another with a smaller pattern that has a cordura/diamond style (could well be screen-printed as well).
If you are not fussed about being 100% accurate on the fabric, I would probably recommend the 2mm foam stretch sandwich mesh from Rockywoods. I have a swatch and it looks quite nice and stretches better than the mesh I got (and used) from Mood Fabrics. For the Avengers suit, I'm pretty sure the mesh from Mood Fabrics was more accurate, but the suit materials in Civil War & AoU look quite different.
http://www.rockywoods.com/Fabrics-Kits/Spacer-Meshes/2-0mm-Foam-Stretch-Sandwich-Mesh
Come to think of it, I think if you used the patterened side of the 2mm as the tighter patterned cloth and then printed the larger hex pattern on the smooth side, you could probably do the whole suit with just the 2mm mesh. You might be able to the printing by glueing a hex mesh on the fabric and then applying a puffy dye layer on top. Once the dye is dry, you would pull the mesh off to leave the hex pattern. All theory...I haven't tried this (I'm not going to make any other versions of my Black Widow suit other than the Avengers version).