What color is leisure suit?
You think it's good to match the colors.
Whether to stuff it into your pants or not depends on your age and the length of your sweater vest. Young people wear casual clothes anyway. It doesn't matter if it's informal, even the sweater vest will be exposed under your shirt at will.
You'd better insert the mature ones.
Shirts can also be formal or casual. Wow ~ ~ ~ You can choose ~ ~ ~