Fashion - For the portly gentleman

[Golden_Rhino]

I am not offering any tips, but I am looking for some. I am a portly gentleman 6'4 ~300 lbs, not as fat as that sounds, but I have yet to meet a slim 300 pounder. I say I'm not as fat as it sounds because I have played sports my whole life, so I'm not perfectly round (think the physique of a centre, or a blocking TE in the NFL).

My problem is that my daily wardrobe consists of jeans, t-shirts and sweats. I am going into a profession (teaching) that will require me to dress a little more than a grown up. I have 2 criteria for any tips:

1. I am looking for a business casual kind of look. I don't wanna be the teacher wearing a 3 piece suit.

2. It must be age appropriate. I am 32 years old, so what is cool for a 20 year old, might look pretty dumb on me.

I hope that this thread turns into a good resource for the big boys out there (and since it's the internet, I am not alone) to be fashionable in a little man's world.