Captain America: Civil War - 16 Things We Learned From The Directors' Commentary
3. Spider-Man Could Have Looked More Radical
The directors say they "experimented" with more radical Spider-Man costumes before clearly seeing sense and going with the more simple, classic look. The fact that they even entertained going stranger is a little worrying.
It doesn't sound like they were entirely sure if Spider-Man: Homecoming would even use the same costume entirely. In regard to the Spider Symbol that is revealed in the post-credits stinger, they certainly aren't sure it's coming back, at least:
“I really hope they use this in the Spider-Man movie, we’re going to look pretty stupid.”
Incidentally, it is also revealed that Tom Holland has not seen Empire Strikes Back, despite his in-film gag (which the Russos say they were initially against).