The outfit you have will dress up or down pretty well with no purchases. You can always put on a dress shirt, tie, and sweater and be pretty spiffy for a little something extra. And tee shirt will work for a really casual, slopping the hogs type of day.
For more dressy events, you will definitely want a nice sporran, dress shoes (I recommend a cap toe as opposed to the wing tips, but that's just me),

and a jacket will eventually be needed unless you really never go dressed up. (I also recommend that you save up for shell cordovan shoes; they'll outlast you.)
An argyl will definitely suffice for "pretty dressy" as well as "not-too-dressy," but I prefer the looks of a tweed like this:

Look at the jacket, not the knucklehead wearing it.
For most of the events I attend, the charcoal tweed is plenty dressy. Except for the occassinal black tie event, it does fine. For black tie I either wear a tux or a PC. If you are prone to going to more dressy events, you might prefer the black argyl.
Good luck, take your time, and buy for quality.
Jim Killman
Writer, Philosopher, Teacher of English and Math, Soldier of Fortune, Bon Vivant, Heart Transplant Recipient, Knight of St. Andrew (among other knighthoods)
Freedom is not free, but the US Marine Corps will pay most of your share.
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