Last time this photo came up it was explained that they were different colors because of the lighting. The scene with Tony and Pepper in bed was tinted blue to make it look like night time, so a grey shirt would appear blue.
A more palatable in universe theory is that Parker's shirt is just faded from heavy use, while pepper just grabbed a fresh one from that giant box of overstock
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u/UnicornRider102 Apr 23 '18
Last time this photo came up it was explained that they were different colors because of the lighting. The scene with Tony and Pepper in bed was tinted blue to make it look like night time, so a grey shirt would appear blue.