Sweater Vest Tucked In or Not?

[cessna152towser]

If wearing trousers I always wear the sweater outside, but with a kilt I often tuck the sweater inside the kilt as I think it looks much smarter.
Its all a matter of personal taste, inside or outside is equally correct.
If you tuck the sweater inside though, you do need to allow for the added thickness, by being able to loosen the buckle straps, and belt if worn, by a notch to allow for the extra girth.