"I have been looking into getting a double breasted suit , and the Mahon picture convinced me! I wear suits mostly during the academic year (September through May). Would you suggest the six button? Are cuffs / pleats suggested for the DB? Is there a decision on peak /or notch lapels? I don't have the deep pockets for custom /bespoke work, any makers I could order from that you would recommend?"
I recommend a six button DB in 11 ounce worsted, with pleated trousers. DBs always have peak lapels and DB trousers are always cuffed. I haven't used them myself but you might consider Hong Kong's W. W. Chan. I've seen some good work from them and they'll be visiting seven U. S. cities in March. Expect to pay about $1300.
From M T
"I was wondering if one can wear "dressy" loafers, i.e. Bruno Magli Remiglio or Allen Edmund Bruzzano with a suit and look professional in a business environment?"
Loafers are what the English shoemakers call casuals. Some of them are fine with suits, particularly the ones that are styled like dress oxfords, and particularly in warm weather, with the caveat that they do not support your feet as well as oxfords. You shouldn't wear them when you have to do much walking on pavements.
In my opinion, and the opinion of others who know a lot more about shoes than I, Bruno Maglis are overpriced and most of the models are not well constructed. Enough said.
Allen Edmonds makes some respectable shoes. I don't like the metal bits on the Bruzzanos with a suit, but the Bergamo pictured to the left is the same price and might be an alternative for you.