I'm not an expert on car seats, but there are a few things that I know for sure. The chest clip should be on their chest. The straps should be snug with no room to pinch. Bulky coats and clothing can cause issues with compression.
Lately I have seen a lot of photos of LO's that are not properly restrained. Particularly on facebook. If I had a photo up and someone saw a problem then I hope they would tell me. It's sort of awkward because the people I've seen with some issues are not close, personal friends. Some are hardly acquaintances. I am going to post a video that has some car seat tips and I hope some of these people are paying attention. It's my lame attempt to put the information out there without calling anyone out. I really just want everyone's child to be as safe as they can possibly be.
Have any of you ever said anything to someone about this? Or something similar?