That's because the gray pants have the same fabric as last year and the jerseys are the new fabric. You can use the same dye lot, and basically the fabric goes into the same vat of dye and is dyed the same shade of gray, but different fabrics will react to dye differently. Or they will react to light differently.
So it's not really consistent, but something is off. You see it in enough situations, enough camera angles, enough teams, where something is clearly off. To me, it looks like the jerseys in general have a little bit of a blue-gray sheen. Not shiny exactly, but they have a little more reflectivity to them. And the pants have more of a dull, putty finish.
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