The bedroom is your sexual side. Breasts usually lucky, because if you consider before formula milk was invented, a baby's only means of survival was breast milk so in fact the whole human race depended on boobies to survive! Therefore it's a lucky symbol of love and joy.
Since you're a man (the interpretation is different for a female dreamer), then the bra means that you will be seduced by someone (not necessarily X) but not to rush into anything - remember the old saying, keep out of someone's panties or you'll get burned, LOL.
Of course, it could also be wish fulfillment in that you might want sex with your X again, LOL.
