Any athlete, at any level, who is at all serious about their sport, tends to be very ritualistic, routinized and even superstitious about what they do and when. This includes what they wear and when.
Anything that disrupts that can be a distraction, especially if it is something that is used as inconsistently as these jerseys. There are certain uniform changes that are no big deal, such as when they make them a different color or have the El Heat, Los Lakers, etc. jerseys. Those are no big deal because the fit of the jersey is the same.
However, when they suddenly have to wear these tight fitting, sleeved jerseys, I can see where the feel of the uniform would be different and that can have an effect. Think about if you're a person who always wears loose fitting clothes and then suddenly have to wear tight fitting clothes. You definitely notice the difference.
Anything that disrupts that can be a distraction, especially if it is something that is used as inconsistently as these jerseys. There are certain uniform changes that are no big deal, such as when they make them a different color or have the El Heat, Los Lakers, etc. jerseys. Those are no big deal because the fit of the jersey is the same.
However, when they suddenly have to wear these tight fitting, sleeved jerseys, I can see where the feel of the uniform would be different and that can have an effect. Think about if you're a person who always wears loose fitting clothes and then suddenly have to wear tight fitting clothes. You definitely notice the difference.