Here is another proposal for the time travel suits in Avengers Endgame, applied on Black Widow. This version imply Stark nanotech as you can see on the Mark 50. The idea here was to start from every character usual suit and look and then to build the suit on top. And also to keep some important feature visible for example here the holsters and the darts bracelet. I had fun building this suit step by step and developing some motion too. Still with my Kronos logo (backward, pause and play for past, present and future) done with two arc reactors and two red vertical lines refering to Pym Tech.