What works for me is a Glock 30S (45 ACP with 10-round clip) and Crossbreed Super-Tuck Deluxe IWB holster. It's comfortable to wear all day, easy and effective to conceal, even with a tucked-in shirt.
Don't forget;
even with a Concealed-Carry Permit in Mississippi, you still cannot carry in many places (including on any college campus) unless you have the Enhanced Carry Endorsement on your CC permit. To obtain an Enhanced Carry Endorsement requires you attend a class and qualify on a range. Then you get a certificate from the instructor that you have to take back to the Highway Patrol station to get your endorsement. If you have this, then it is legal to carry on the MSU or any other campus, I believe.
Once you have the Enhanced Carry Endorsement there are only 3 places you cannot legally carry: 1. Highway Patrol or other police stations, 2. any courtroom while court is in session, and 3. a "place of disturbance". The last one is pretty vague (probably intentionally) but I believe that it might mean, for example (but not limited to), that you cannot carry a weapon if you go over to visit your wife that your are separated from if you have not had a friendly relationship recently.
This still does stop a business owner from putting a sign in the window that prohibits carrying on their private property. Anyone who owns private property has the right to decide who can, and cannot, enter their property. If you do carry in such a place, my understanding is that you are, at most, guilty of trespassing but not guilty of a firearms violation. Just keep in mind that if no one knows that you are carrying (
concealed carry) then you probably will never have any problems. Just think ahead to decide if there is any reason, other than to use your weapon to defend yourself or others, that you might have to reveal your weapon. Examples that come to mind could be a tailor or doctor's office where you might have to disrobe and possibly expose your weapon.
Also, you need to keep in mind that federal property is not necessarily subject to Mississippi gun laws. For example, it is my understanding that if a U.S. Military installation says you cannot carry there, then Mississippi gun laws do not override that.
Lastly, there are still places you still cannot carry such as when traveling as passenger on commercial airlines and other places like that. I'm pretty sure that the TSA nazis will not let you carry a gun through their inspection process but I don't do much commercial air travel so I don't know for sure.
I know that Mississippi and several other states have concealed carry reciprocity agreements but I"m not sure how that applies to the enhanced carry permit if your permit is not from Mississippi.
A few useful links on this issue:
Mississippi Concealed Carry Permit Information
List of Enhance Carry Firearm Permit Instructors in Mississippi
Good summary page of Mississippi handgun laws including links to handguns laws for all states
Concealed Carry Reciprocity Maps
Disclaimer:
I am not an attorney nor am I a certified firearms instructor so read this knowing that I am not offering "official" information. This is just information I've gathered in the process of obtaining my own Concealed-Carry Permit and Enhanced-Carry Permit. I'm just trying to be helpful.
Edit:
Just one final thought. If you don't already have a Concealed Carry Permit, don't decide to get one just because you think it would be cool to have one. You need to do some deep thinking and soul-searching. You need to decide first whether you have the will to kill another human being if the situation warrants. You need to give some deep and serious thought and research ahead of time as to what situations justify the taking of another person's life. Once you have drawn your weapon, you should have already decided beforehand (and I mean days, months, or years beforehand) not only what gives you legal justification before you shoot another person, but also the moral justification of shooting someone. In nearly every case, you should avoid, if possible, situations and/or places where scenarios like these are likely. Your first response should be, if possible, to avoid shooting someone by leaving the area or convincing the dangerous person to stop the attack through intimidation, deception or other less deadly means. Mississippi does have "stand your ground" laws but if you can avoid a dangerous situation where you might have to draw your weapon, you should do so unless you are entering to protect some other innocent person who cannot protect themselves. You should never draw your weapon unless you are ready to shoot
without hesitation (that's why you did all the deep and serious thought beforehand) to protect yourself or others. Do not wait until that moment to start thinking whether you are willing to go through with it. If you draw a weapon but are unwilling to use it to defend yourself, your attacker could possibly take the weapon from you and use it on you or your family.