I just regripped a set of golf clubs for a friend of mine because he had long fingers and the standard grip size was causin g him to have the incorrect grip. The floor stock of golf shops that are supplied from the golf companies come in a standard grip size. However many golfers have larger hands or longer fingers. A standard grip size makes taking the correct golf grip difficult. Just ask your pro or shop assistant to assess whether you would be better off with thicker grips.
There are two ways to do this.
The grips are taken off and layers of tape are wrapped around the shaft before the original grips are put back on. You may get one to four wraps of tape.
Use thicker grips that come in various sizes like midsize or oversize. You need new grips for this option.
This process takes about an hour and unfortunately most shops don't give you the extra service you need to help you one of the important fundamentals of golf, the grip, correct.