Whether you do sports to make a living or simply to kill spare time (or perhaps in place of exercising at the gym), you need a jersey to achieve better result in the process. See, a jersey is more than just a piece of clothing to wear during the activity. It is your second skin, one that will offer protection to your body throughout the time you are doing said activity. A jersey will protect your body from exposure to sunlight, dirt, and (to an extent) injuries. A jersey is also capable of absorbing sweats your body produces from the activity, further increasing the level of comfort you have in the process. However, said feats are only available if you choose the best jersey made by the best jersey maker. Jerseys that are poorly made will never be able to get the chance to provide you with the aforementioned values. As a result, you will be doing sports while being tormented by the very thing that is supposed to provide you with comfort and protection. Nobody likes to run on a field wearing a jersey dampened by the sweats their body produces, right?
When your mind is obstructed by the overly uncomfortable jersey you are wearing, your focus will be severely undermined. As a result, your performance would be less than what is expected of you. You will not be able to give your best and the very purpose of doing sports would be negated. A simple thing like jersey is easy to overlook. You are so used to taking whatever necessary and neglect the needs to have the best item that support your activity. Choose a professional jersey maker to help make you a superb jersey that ticks off all of the boxes. However, you might be unwilling to take this route due to the very obvious reason: price.
Jerseys sold at the sportswear shops are considerably cheaper because they are pre-made. You will only have to pick one that has the correct size that matches your body and take it home to wear when needed. Its materials and the way it is made are never of any concerns to take notice. But a maker would be able to make a jersey that is tailored specifically to your requirements. So, maybe it is time for you to consider going the other way around rather than picking anything available on display.