OP, I’ve already posted about your DD’s behaviour but try not let this destroy your confidence about how you look. The world is full of over-weight people and they can still look and dress well. I see over-weight people all the time and yes, they could do with dropping weight but my first thought would be, I like their outfit shoes, etc, rather than their body shape. I don’t think most people go around thinking oh that person is overweight because in reality, we couldn’t care less. Good manners and being friendly is much more important. If you feel good in what you’re wearing you will have a spring in your step as such, so wear your new clothes with pride.
So, ditch the leggings and tunics, wear your new wide leg trousers. Nice shoes/trainers and a bag, jewellery, whatever. Take an afternoon to go shopping by yourself, even if you don’t buy anything, try on lots to see which shapes/lengths/colours etc suit you best and it will make online/future shopping easier.
Don’t make any reference, excuses or apologies to anyone about your body shape. If you want to diet, then do it for yourself not because a 10 year old has called you fat.
If you’re in the trap of spending most of your budget on clothes and activities and stuff for yourself children, leaving nothing for yourself, get yourself out of that trap. Most of our children have far too many clothes and you deserve nice clothes as much as your children. Let your DD see you have your own life too by taking time out by yourself to go shopping, meet up with a friend for a coffee, get yourself nails done or whatever. Find yourself a hobby. Take an hour by yourself in the evening to go for a walk
I hope you are feeling better about things today.