Earlier today an image of an “Avengers 4” crew jacket started to be spread around Reddit, but no one was able to find the source of it or if it was legitimate or not. After doing some digging tonight I found the original image, and it does appear to be a legitimate crew jacket from the production.
An image posted on Instagram more than a month ago is the source of the (edited) Avengers 4 image that was going around, and the location settings on the Instagram post were turned on showing that it was taken at Pinewood Studios in Atlanta:
According to the image, it’s from a member of the lighting crew on the joint Infinity War/Avengers 4 production in Atlanta. From the looks of it, the jacket is reversible with Infinity War on one side and Avengers 4 on the other.