A few ideas.
We'd love an update, how are you doing now?
For what its worth, it was actually great news that you had put on weight AND fit your clothes better.. that means just one thing.. you were building some muscle mass... muscle weighs more than fat, and it also burns up more calories... the body has to keep replenishing and maintaining the existing muscles and that takes some energy to do.
So.. regardless of the snacking you seem to have been doing ideally, and would probably have begun to see the scales start nose-diving at a faster rate than they could have done if you hadn't improved your muscles.
On the topic of too much snacking.. optimum eating is to eat smaller portions more often... so maybe if you know you are 'a snacker' then make the main meals very small to compensate. If you also like a nice bowl/plateful at breakfast/lunch/dinner then tilt the plate mostly salad/veg, medium protein, and small carbs, again in consideration of your snacking prefereces.
Also, maybe you don't realise that it is actually correct behaviour to have one snack between meals.. maybe by refusing to have a healthy snack midway between meals you are extra vulnerable to those snacking urges for unhealthy items?
You could also make yourself up a 'snack box' at the start of the day (same time as you make yourself breakfast)... it can contain a few small guilty pleasures and a range of other suitable snacks... that's your snacking allowance, and if you use it up then you don't get any extra.. your decision then simply 'when', not 'what'.
I hope any of these comments might be a help.