Separating flattering colors from familiar colors

[Ameliaka]

I am putting together a smaller work wardrobe after a change in size, and I keep mixing up two separate decisions: whether a garment fits well and whether its color works near my face. I can judge the fit in a mirror. Color is much less clear under shop lights. A charcoal jacket seems useful, yet several shirts I already own make my skin look dull when I wear them with it. I want to make the clothes I own work before buying more pieces. I have been reading about color analysis and comparing those notes with ordinary fit advice, but I still need a simple test I can repeat at home. Would you compare a few shirts beside a window and photograph them against the same neutral background? I am especially unsure about navy versus charcoal because both seem sensible on a hanger. I also wonder whether a warmer cream shirt would be more helpful than stark white. If you have narrowed a wardrobe this way, which observations actually helped you choose repeatable colors rather than just picking the outfit that looked best in one photo? I would appreciate a low-cost routine so I can keep fit and color decisions separate while I make a short shopping list.