There are many different kinds of holsters also. You can get a holster that will allow you to carry your gun in a suitcase or another gun bag. This type of holster is usually padded and covers most of the gun. The gun is not that readily accessible as this holster is usually used for long storage or to be put in a place where you will not need to access the gun very quickly.
Another common type of gun holster is one that is designed for someone with a concealed weapons permit. These types of Sig Sauer holsters are generally located in a place where you will not know that they are on your person and you will not even know that you are carrying the gun after awhile. The holster could fit under your arm or it could fit on your thigh. The holster might also fit in the small of your back where nobody else could see that it is on your person. Almost all of these holsters also have a quick draw feature that will allow you to have access to your Sig Sauer at a moment's notice. After all, what is the point of owning your concealed weapons permit if you are unable to carry the gun with you and have access to it whenever you want.
If you want a decorative holster for your gun you could also buy many Sig Sauer holsters that clip onto a belt look. These are mostly used for wearing on person property or on a ranch or farm where you might need very quick access to your gun in the event of having to use it for personal safety.