Dieting but gaining weight

I'm afraid you're going to have to have patience. You're already a healthy weight so it's most likely going to take some time to lose the few pounds that you want to - possibly months rather than weeks. I have no idea if 1500 is a deficit for you, it depends on your activity level and all the other info you enter into your profile when you tell it how much you want to lose.

If you really want to go for it - bearing in mind what was said earlier about your goal actually being a bit underweight for your height - I'd suggest setting up your profile for 0.5lbs per week and be very thorough and consistent in your weighing and logging (even if you eat something that puts you over your goal), because with a small deficit it doesn't take much to wipe it out. You're also probably more likely to see fluctuations that might make it seem as if you're not losing, or even gaining, in the short term. Try to look at the longer term trend.

Finally, be prepared that even if you do get down to your previous weight when you wore those clothes, your body may have changed and they still might not fit you. You might want to consider recomposition instead, which would help to trim your figure while remaining a healthy weight. Check out this thread for some info, but be aware that this is also a process that needs patience and time!

https://community.myfitnesspal.com/en/discussion/10177803/recomposition-maintaining-weight-while-losing-fat/p1