In sunlight, dark clothes absorb more heat and light-coloured clothes reflect it better, thus allowing some control over body temperature by exploiting the albedo effect of the colour of external clothing.
ɪn sˈʌnlaɪt, dˈɑːɹk klˈoʊðz ɐbsˈoːɹb mˈoːɹ hˈiːt ænd lˈaɪtkˈʌlɚd klˈoʊðz ɹᵻflˈɛkt ɪt bˈɛɾɚ, ðˈʌs ɐlˈaʊɪŋ sˌʌm kəntɹˈoʊl ˌoʊvɚ bˈɑːdi tˈɛmpɹɪtʃɚ baɪ ɛksplˈɔɪɾɪŋ ðɪ ælbˈiːdoʊ ɪfˈɛkt ʌvðə kˈʌlɚɹ ʌv ɛkstˈɜːnəl klˈoʊðɪŋ.