One thing to worry about is the State's law on "brandishing". "Accidentally" letting your jacket or shirt expose your CC in order to "intimidate" someone might be construed as brandishing and there can be laws against that. (Check out Washington.)
I've yet to see or hear about anyone being charged under the statue (provided below); interestingly, the open-carry faction in this state a few years ago caused most of the law enforcement agencies to issue training bulletins to their officers clarifying what constitutes intent to intimidate or warranting alarm -- holstered handguns generally do neither. And intent has to be proven (usually difficult absent actions or words), and although metro King County and a few other pockets around here are totally wussified and populated by whining liberal hoplophobes, I do not think this is an issue to worry about (in this state or Arizona, where I've also resided).
RCW 9.41.270
Weapons apparently capable of producing bodily harm—Unlawful carrying or handling—Penalty—Exceptions.
(
1) It shall be unlawful for any person to carry, exhibit, display, or draw any firearm, dagger, sword, knife or other cutting or stabbing instrument, club, or any other weapon apparently capable of producing bodily harm, in a manner, under circumstances, and at a time and place that either manifests an intent to intimidate another or that warrants alarm for the safety of other persons.
(2) Any person violating the provisions of subsection (1) above shall be guilty of a gross misdemeanor. If any person is convicted of a violation of subsection (1) of this section, the person shall lose his or her concealed pistol license, if any. The court shall send notice of the revocation to the department of licensing, and the city, town, or county which issued the license.
(3) Subsection (1) of this section shall not apply to or affect the following:
(a) Any act committed by a person while in his or her place of abode or fixed place of business;
(b) Any person who by virtue of his or her office or public employment is vested by law with a duty to preserve public safety, maintain public order, or to make arrests for offenses, while in the performance of such duty;
(c) Any person acting for the purpose of protecting himself or herself against the use of presently threatened unlawful force by another, or for the purpose of protecting another against the use of such unlawful force by a third person;
(d) Any person making or assisting in making a lawful arrest for the commission of a felony; or
(e) Any person engaged in military activities sponsored by the federal or state governments.