I like Numbers 3 and 4 the best.
The blazers in Numbers 1 and 2 look a bit too big to be worn with a belt, even though the style trend is the over-sized look.
In the past, I have belted jackets when I felt that they were a bit too big when I wore them without a bulky sweater. Belts could 'slim down' jackets that are a bit too roomy.
'More or less', 'Right or wrong', 'In general', and 'Just thinking out loud ' (as usual).