Supernatural forces have conspired to bring about massive changes in the lives of various lucky individuals. Since a time long forgotten, their code required of them that they use brassieres to initiate said changes (okay, so Ergon-X7 was bored that day and happened to be doing the alien equivalent of throwing darts randomly on a board to make their reality-changing powers a bit more fun)
Basically, they start by deciding on a specific bra that the subject should be endowed with. Style, color, band size, cup size, and all other possible details are carefully considered to create a new personality, body, and world for the subject that could cause the most chaos (or wholesomeness, on a good day) possible.
Next, said bra must first appear within the subject's dreams before manifesting itself into physical space. Some aliens choose to bless their subject with a vision of their completed new form early on, while others may go about manipulating said dreams more subtly. This can depend on the temperament of a subject, who may or may not be willing to undergo such changes early on (though in most cases, subjects do not retain memories of their original reality and as such, will eventually conform to their new world). An agent may utilize dreams as often as they wish to make their subject more comfortable (or perhaps to simply prolong their confusion and fear...)
What has been well documented is the reality changes that soon follow the subject once the brassiere is worn (and once physical manifestation occurs, it's only a matter of time before the wearing phase- whether by force or by mental changes)
-A note that, with our species' millennia-long use of this power, bras at times have been noted to gain some sort of sentience of their own. Some have even been noted to talk to their host in attempts to induce suggestions and further their changes. It has also been seen that bras are fairly possessive of their hosts and, while willing to accommodate for several other brassieres in the subject's wardrobe (for hygiene's sake), by and large, they will make sure to be the primary undergarment in rotation.
Below is a list of successful subject endowments and the history of their changes.
(aka- Who will become our first unsuspecting victim?)