What should I wear in Yan 'an on May Day?

Shirts, thin long skirts, thin T-shirts, etc. Made of cotton and linen fabric. The average temperature of May Day in Yan 'an area is 10℃-25℃, and the average temperature during the day is 25℃. The temperature is very high. Suitable for wearing cool and breathable clothes such as cotton and linen shirts, thin long skirts and thin T-shirts, you will feel that the temperature is suitable, neither too hot nor too cold. Yan 'an has a warm temperate semi-arid monsoon climate, with an average temperature of -5.2℃ in June, a minimum temperature of-265,438 0.4℃, an average temperature of 24.65,438 0℃ in July and a maximum temperature of 38.3℃.