Why is white dress more comfortable than dark dress in summer ?

because black dress is a perfect absorber . hence it absorbs heat . so become more warmer than white deres which reflects light.
Thanks & Regards
Mukesh Sharma
askIITians Faculty

Black dresses are black-bodies and obey black body laws; they black-body absorb all sorts of radiations (vast wavelengths of radiations) and black-body radiate the absorbed radiation into radiation of different wavelengths (refer black-body radiation).These radiated radiations may fall in the thermal radiations` range.And we feel being cooked. Nidhin S R Trivandrum University College Physics Dept.

because black dress is good absorber of heat therefore making the body warm .

black dress is good heat absorber than white dress.If you wear black dress in summer you feel very hot

black dress is a good observer of heat than white dress.so in summer it is best to wear white dress to protect from heat.