Rida,
Based on your posts.....it seems to me that your problem is MORE serious than just your breast/bra size. Your problem is that you are married to a husband who doesn't respect you or make you feel good about yourself AND you also live with toxic in-laws. Your in-laws are (due to their own insecurities) trying to control you. Even if you had the BIGGEST breasts in the world.........your in-laws will still treat you bad. Even if you were PRETTIER than MISS WORLD.......your in-laws will still find ways of abusing you emotionally and mentally. You could be the most beautiful big-breasted woman........and your husband may STILL treat you just like his mother and sister.
So, you've got to be strong......and figure out how to tackle the ROOT of the problem.....which is NOT breast size. The root of the problem is your husband and in-laws bad behavior.
About your husband............start being more confident. Even if you have to fake it....do so. The next time you want to go out.........you go out. Are you seeking your in-laws' permission for everything? Tum kya har kam ki ijazat leti ho? Agar tum aisa kar rahi ho...........to yeh tumhari ghalati hai. Jab hum kisi se har chotay se chotay kaam ki ijazat mangtay hain.....to doosra banda maghroor ho jata hai. If you feel like going shopping.........finish your household responsibilities........get dressed............tell your in-laws that you're going out and that you will be back in this amount of time. AND THEN GO. Don't wait for them to make excuses. Just go.
When your husband says you're ugly........tell him "Agar khuda ne tum ko achi shakal di hai....to phir us ka shukar karo....gharoor mat dikhao. Allah jo daita hai woh cheen bhi sakta hai." Make him feel ashamed of his stupid comments.....and then just walk away and get busy in something.