A practical way to compare clothing colors

[Jackol]

I spotted a good coat in a charity shop that fits my shoulders and has plenty of life left in it, but I cannot decide if the muted green is a useful color for me. The changing room has harsh overhead lights. I cannot trust my usual mirror check there. Outside, the coat seems softer and less yellow, which makes the decision even harder. I am trying to buy fewer things and would rather leave a bargain behind than own a coat I never reach for. I have looked through personal color analysis while thinking about this, though I am wary of treating one photo or one label as a final answer. Would you bring a familiar scarf and check the combination outside before deciding? Another option is to check it against my everyday shoes to see whether it fits into real outfits rather than an imagined wardrobe. I am interested in methods that work on the spot without asking a friend to judge every purchase. What signs tell you that a color is worth taking home despite imperfect lighting? I do not mind walking away from it but I want to learn a better process for the next good find.