How do you understand what colors suit your skin type?
Your skin could have cool undertones or warm undertones. That would figure out whether you look better in cool colors or warm colors. Warm complexions have a yellowish undertone, while cool skin tones have a blue undertone.
Look thoroughly at your skin in comparison. If you see a yellow-colored cast, then you have a warm skin tone.
Try this if that does not work.
Do you look much better with the peach scarf or the blue scarf? If the peach scarf makes you look much better, then you have a warm skin tone. If you look much better in blue, then you have a cool skin tone.