You can carry however you prefer on your own property. I regularly OC in my yard. The only time I would throw on a cover garment when answering the door, is if it's one of my wife's clients (no need to add that additional element to her business).
Here's the law:
ยง 46.02. UNLAWFUL CARRYING WEAPONS. (a) A person commits an offense if the person intentionally, knowingly, or recklessly carries on or about his or her person a handgun, illegal knife, or club if the person is not:
(1) on the person's own premises or premises under the person's control;
Since there is no crime of UCW on your own property, there is no legal concern at all.