Luftstalag14
Culé de Celestial Empire
Well, tbh it depends from shirt to shirt about the size, even if it's Nike and even the same team/season.
Our replica home shirts are usually baggy, sometimes our away's have a much better fit I sense.
I would get the authentic XL then and replica's in L.
Also, material seems to differ a lot, which bugs me when thinking these new shirts are made from recycled bottles.
Dri-Fit is more of a standard than the same on every shirt. I heard that in 2011-12 players were initially unhappy with the material of the shirts because they were made of recycled bottles and they were frying themselves in them so they changed them or something.
The quality differs from shirt to shirt, for example, very comfortable in Brazil's WC 2006 shirt or Barca 2010'11 away ( pink/orange one ) while others like the 2008-09 away are much less softer and weight even twice as much IMO.
I understand what you mean by using different materials under the label of "Dri-Fit", I noticed too the difference in thickness and softness of the various materials branded as "Dri-Fit" throughout the years. Personally I prefer the Adidas Climacool fabric, softer and not sticking on your body that much.
As to the change made to the 11/12 jersey, it had nothing to do with the materials being made out of recycled bottles. Nike has been using recycled bottles for several years. Initially the player-issued 11/12 jerseys used the same close-knit, small-holed fabric, the same as what they used for the front panel of the jersey for the back panel of the jersey, so the players complained about it not ventilating sweat enough. Therefore they switched it to the mesh-ier fabric featuring bigger holes for the back panel after the complaints. That's it.