Is a double a bra smaller than a regular a bra?

YES, though most stupidheads say it is bigger. WRONG. I am a girl and I know and DOUBLE SIZES ARE INDEED SMALLER.

Actually, you are wrong there. You may be a girl, but you do not know bra sizes very well, Double A Bras are SMALLER THAN AN A cup. Double D bra's are BIGGER THAN A D CUP.