Sorry if this has been covered before.
I've always thought the plastic film covering the chest lights was a standard dark tinting, or even the same stuff as what's in the T-visor. However, the costume at AOSW appears to have had red tinting.
While the MOM costume appears to have had the darker film that I always assumed was standard.
Again, don't know if it's been hit on already, but I thought it was an interesting variation. Red would kind of make more sense. Hmmm, may have to buy a cheap thrift store digital clock this weekend . . .