It's No Bra Day which is held yearly since 2011 and is typically included in National Breast Cancer Awareness Month. There is a world wide contingent of observers and has been related to "Breast Reconstruction Awareness Day" from which it originates.
Now I'm not one objectify others nor knock anyone for their choice of garments and do I generally refrain from the ogle of every bodacious set of ta ta's I encounter. If you want to go braless I suppose it's between you and your garments.
Some ladies get serious backache from the pendulous nature of the female breast and as a man ... though I like the pendulous stuff I'm more attuned to the health issues therein.
Breast health, though predominately a female issue is also a male problem from a standpoint of cancer. So if you want to go braless I I think it's your perogative and that decision should be free from any manner of undesirable scrutiny on the part of others..
After all you need to project that awareness indigineous to your personality and you should have the right to go forth into the community without being sujected to excessive input from some one less initiated to the female requirements in that particular area.
So have yourself a merry little No Bra Day regardles of how they may be situated in your own foundation garments ... or lack thereof.