This could be an allergic reaction to something; these could be tall grass, shoes, sandals, socks, or anything. I think you should change the shoes and socks to something else. And too dry skin is also a reason for these itchy legs. So, it is better to consult a dermatologist; you can easily find the treatment at the nearest general hospital. I'm saying this because the same condition happened to me a few years ago, and I used to take some medication that cured me. My father had a similar condition, which was resolved by changing the type of shoes.