Assalamu alaykum brothers and sisters. I hope you are all well. I came across the word mahdar (transliterated from Arabic),and I don't know what it means. Here is some context: Aboo Dawood said, "I used to see Aboo 'Abdullah's buttons undone, and I sometimes saw him with mismatched socks and sandals. I never saw him wearing a mahdar or anything having two straps." If it helps, the above is from the biography of Aboo Dawood and he's talking about Imam Ahmad.