Well, you've got a couple of issues going on.

First, if you don't exercise much, you probably don't have a huge caloric deficit. For example, the online calculator I use says maintenance for me at goal weight, with a sedentary lifestyle, is a whopping 1,500 calories per day.

Second, you aren't waiting nearly long enough to know if your plan is working. If I ate 1,400 calories a day, it would take more than a month for me to lose a pound of "real" weight - and probably 4-6 months of steady loss at that rate to have enough loss that it stood out from random scale fluctuation. And that's assuming that my body didn't say "Hey! What's with the less food?" and subtly encourage me to sit instead of stand, walk instead of run, sleep a few minutes longer, and otherwise conserve those 100 calories a day.

Third, you can't "spot reduce." There's no way to lose fat from specific places without losing it everywhere else - and those specific places are likely to be spots you're genetically inclined to gain first and lose last.

I vote for regular exercise, myself. And if you're growing out of your clothes, eating too few calories is probably not the reason, people on the internet notwithstanding.

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