why doesn't the tuxedo fit, did you rent it?
If you didn't rent it and it is yours, why didn't you try it on before hand to make sure it fit?
If you did rent it, you should request your money back, they are supposed to give you a working, fitting article of clothing.
If it doesn't fit because you are grossly overweight then, and only then, do I agree with the above poster that you should be ridiculed for posting this.
Dress cloths are not uncomfortable if they fit.