I myself am a gentelman of substance, my personal opinion would be go with the 8yard ( it will probably be more like 9yards, mine is) 13 oz. I think it hangs better than a 5 yard and the pleats are deeper. I wear mine to games and events and have no problem with the heaft. Depending on where you live you may go with an 8 yard 16 oz but that gets fairly warm if you are in a warmer climate.
Good luck and happy kilting!