User blog comment:Commdor/New ME3 Ashley Screenshot/@comment-1691295-20111217063219/@comment-1900300-20111220113355

At the risk of sounding like a complete idiot i will offer a real-world reason. Making female specific armour with different cup sizes would be pointless, expensive and slow down production. So they make armour with a large enough cup for the average woman in the Alliance who would wear it and make the inside form fitting so smaller breasted woman can still feel supported and comfortable.