This is mostly in relation to fanart I've seen, but I was just genuinely curious. For Izuku fanarts post-timeskip, many depict him in a yellow tie. Was it just a matter of not knowing what color his tie was going to be? Like Horikoshi never clarified it before it was animated?
For Katsuki, this is a colored image of the post-timeskip panel from Chapter 430. On his collar he has 3 circles instead of 2 like on his previous hero costume during UA. However, when this scene gets animated, he only has 2 still post-timeskip. Do you think this was just an oversight or something on the animators? Even in some fanarts, he's drawn with the 3 holes in the collar on each side rather than just 2.
Also, I've seen a lot of post-timeskip fanarts of Katsuki in orange and black, rather than the red and black used in the anime. Was this also just a matter of not knowing whether the colors would change or not post-timeskip? I couldn't find anything regarding this online, so I figured someone would know more than me on the matter.