A practical way to compare warm and cool clothing

[Miaer]

I recently began listing a box of older garments on a modest resale account. Last week I described a cardigan as warm burgundy, then noticed it looked plum on another screen. No sale was lost, though the color label suddenly seemed careless. Professional lights and calibrated monitors would cost more than these garments justify. My simple setup is a north-facing window, neutral card, and locked camera preset. That setup improves exposure consistency, and I still struggle to describe whether a shade leans warm, cool, or neutral. I used this deep summer color palette page to build a small vocabulary list. I treat palette labels as comparison terms rather than personal recommendations. I plan to use a plain color name plus a careful note about its warmer or cooler cast. A final reference image will show both the fabric and the unchanged grey card. That approach feels clearer than assigning a confident seasonal label to uncertain fabric. How do small vintage sellers describe undertones without creating false precision? Suggestions for handling colors that shift between berry and brown are especially welcome.