HOW TO CHOOSE A TRADITIONAL CHARM BRACELET
There are three factors to consider when selecting an appropriate starter charm bracelet: First is the proportion relative to your wrist size. Second is the size and weight of the bracelet relative to the size and number of the charms you want to put on it. Third is the style of the links that make up the bracelet.
If you are a big-boned person, you will most likely want the half-inch size unless you have a collection of very small and lightweight charms, in which case you might want to consider something slightly narrower.
If you are a medium-boned person, then you will probably want something in the 1/4 to 7/16 inch range — again, unless you have very large and/or very heavy charms, in which case you would want a possibly wider or at least heavier linked bracelet to be proportional and sufficiently sturdy.
If you are a small-boned or petite person or are shopping for a child, you will definitely want to consider something between 1/4 to 3/8 inch in width.
Wrap a tape measure around your wrist. If you don't have a tape measure, use a length of string or even a narrow strip of paper and mark where it meets around your wrist. If your wrist measurement is less than 7 inches, you are small boned. If your wrist measurement is 7 inches, you probably are more of a medium-boned person and would want something less than 1/2 inch wide. If your wrist measures 7-1/2 to 8 inches, then you probably should be considered large boned.
You will need a bracelet about 3/4 to 1-1/2 inches longer than your wrist measurement, depending on how tight or loose you prefer to wear your bracelet and how much drape you like — i.e. how far up your arm and down your hand you like it to move. One inch is the standard rule of thumb.
Bear in mind that very chunky and thick bracelets will "wear" shorter than they measure, since the flat measurement represents the outer circumference. The inner circumference, which lies against your wrist, will be slightly shorter. Be aware too that if you really load your bracelet down, all those jump rings take up space too and will push your bracelet out from your wrist, making a longer length necessary.
Also to be kept in mind is the size and proportion of the charms you intend to put on this bracelet. Smaller, daintier charms generally call for a lighter, more slender bracelet, and vice-versa for very large or oversize charms. It's also nice to keep in mind the era your charms are from. If you're assembling a bracelet of Victorian charms, you'll want something in the chunkier style of that era, possibly with a padlock heart clasp, or perhaps a bangle. If you're putting together a bracelet of vintage puffy hearts from the 1940s, the fashionable charm bracelets of that time were narrower.