Ancestors wear different shoes on different occasions, such as clogs on rainy days, cloth shoes on weekdays and formal shoes for visitors. It's cold with leather shoes and cotton shoes. Some specific ceremonies will have specific shoes to match. For example, in the Han Dynasty, when the bride got married, she would put on painted clogs and tie colored silk on them.
As for why people in costume dramas wear the same kind of shoes, the answer is obvious. As we all know, the textual research of costume dramas is often not in place.
However, the recent film Red Cliff has done a good job in this respect and is worth learning from.
If you are interested in the following link, you can have a look and learn about your real national costume (about shoes is on the second page).
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