I may be a bit stereotyping here but...... whenever I wear a suit or least look somewhat dressy I get bothered less by the GAs and even get better treatments from TSA people.

For example, same carry on (somewhat beyond standard carry on size) same airline and same class tickets. When I look somewhat business like, GA have never asked me to gate check my bag even when bin were supposed to be full. Yet, on many occasions when I am wearing shorts and t-shirts I get hassles on my bag size.

Same with TSAs. I get much less hassle when I wear a suit or a dressier jacket.

I think these guys figure you are a frequent traveler and leave you alone.....