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Look for a shallow shadow box or similar container, making sure it is deep enough to hold your shirt and any other objects you will be framing with it. Look for border colors that match the jersey itself or the room it will be displayed in. Choose a square shadow box if you plan on folding the shirt to show just the number. Choose a tall, rectangular shadow box if you plan on showing the whole jersey. Store-bought shadow boxes come with a backing board, typically made of cork or thin wood. Remove this like you would the backing of a picture frame and lay it on a flat surface. To spice up a backing board, try covering it with cloth or paper that shares or contrasts with the jersey's colors. Whether you're folding it into a square or displaying an entire side, you will secure your jersey with the same basic method. Use strips of double-sided fabric tape to attach the body of your jersey to the board. Press down firmly on the board to make sure the shirt is secure. Press small dressmaker pins through the jersey to hold any loose fabric down. Look for spots that will be hidden from view, such as inside the sleeves and shoulders. Cover exposed pin points with fabric tape. If you have extra room, try adding some related elements to the shadow box. Small, light objects can be attached just like the jersey itself. For larger, heavier objects, try attaching them with velcro straps or twine. In some cases, items can be rested against the base of the shadow box itself. For personal jerseys, try adding equipment you used while playing like gloves, balls, or pucks. For fan jerseys, try adding team memorabilia like flags or player memorabilia like collectible cards. Look at the reverse side of your backing board to see what kind of mount it uses. In most cases, this will be a generic nail mount. For walls you can alter, find the spot you wish to hang your jersey from and insert a nail or whatever object the mount requires. For walls you can't alter, use a command strip instead. For heavy boxes, make sure to use a strong nail or hook to support the frame's weight. When your arrangement is ready, reattach the backing board to your shadow box. Be careful not to bump or alter the objects inside while doing so. Then, hang the frame and enjoy your new decor.

Summary:
Purchase a large shadow box display case. Remove the shadow box's backing board. Use double-sided fabric tape to attach your shirt to the board. Use dressmaker pins to hold loose fabric down. Attach other decorations to the board if you want to. Place a nail or hook on the wall. Replace the backing board and hang your jersey.