John 3:16 KJV
How do I color this thing?
If you are modeling The Sullivans and using the kit decals, the shaded numbers are post war. That would make her Haze Gray (postwar version) with Deck Gray horizontals.
But sometime between 1945 and 1950 she was fitted with a tripod mast, which the kit doesn't have.
Otherwise, in war time she had small 24" unshaded numbers and was either Navy Blue System (Measure 21), or Graded System (M22).
https://www.shipcamouflage.com/fletcher_class.htm
Of course there are lots of Fletchers, no two exactly alike. FWIW your kit, like the Trumpeter kit; is the later "square bridge", whereas the Tamiya kit is the earlier "round bridge" version.