the answer is YES, IT IS CGI.
The suit having high res texture doesn't mean jack on this subject, you simply can't tell if something is real or not based on the amount of details or texture there is in an object, knowing what computers and the artists can do nowadays.
Now, if you'd like to know about the rest of the movie, I can tell because it has already been released here in Brazil and I've actually watched it, so I'm not just guessing. Continue reading at your own will.
Okay, so it is really dificult to tell by just seeing this particular scene, but it gets much easier to know the truth when you see the way the "fabric" behaves in some close shots with slower movements and when spidey moves his jaw to talk.
There is one scene in particular that makes it obvious that the suit is CGI. In the scene Tom Holland is getting up off the floor in the airport fight and his mask is halfway lifted. You can see a portion of his face, with one eye being covered up by his mask. From the the very first glimpse you can tell that the everything from the neck down is CGI, but the mask is real(in this particular scene only, whenever he's on his full suit with the mask down, it is always CGI).
Now, I have no doubt that they used MoCap to capture Tom's movements in this scene and in many others, it is cool to see it. But that is pretty much what makes it so easy to tell that there is NO physical Spider man suit in this film. There is no reason for them to use MoCap and a CGI suit in a scene with no action at all like this one, it just doesn't make any sense.
So, there is a real mask (with eyelenses that don't move, obviously), but unfortunately there's no suit yet.
Probably because they didn't have the time needed to experiment with materials and colors. The Russos' twitter pics where probably from a costume study and early suit experimentations for the Spider man Homecoming.