The term 'respectable chest' is reallllly funny to me lol
The reality of it all is with time, your chest will pop out.
One thing that hasn't been mentioned is that some people's chest pop out more than others. It's partly genetics.
I don't mean to gloat, but i have always been proud of my chest and im skinny compared to most i see at the gym. at 5'9" and 163lbs, i've always had no trouble getting my chest to look wide and full whenever i get back into working out again.
Just always keep adding weight to your max every chest day,
Oliver James, and hit EVERY part of your chest: upper, mid, lower, inner and outer.
I never used to focus on every part of my chest and that was my demise. Ever since i started targeting every part of my chest during chest day, my chest looks and feels great.