Short or Long Sleeve
If you are designing your kit on an online kit builder, the first choice you will encounter is often whether you want short sleeve or long sleeve.
It is an important question in terms of weather, preference, and even style. You will probably pay slightly more for the long-sleeve but it is certainly becoming more aesthetically popular.
Another factor to consider is goalkeepers, who prefer to have long sleeves, and at Serious Sport, you can also include elbow pads to help support goalies when they dive.