Your post #2..."Did people wear pants during ancient times?"
Yes, they did!
Ancient times going back to the time of Moses and the Hebrew Tabernacle in the desert...The Tent Of Meeting/The Miskan.
The Lord G-D commanded Moses to instruct the Kohenim: The High Priest Aaron and the Levites who served in The Tabernacle along with those who served under them to wear special undergarments.
Read: Leviticus 16:4, NIV Study Bible...
"He is to put on the sacred linen tunic, with linen undergarments next to his body; he is to tie the linen sash around him and put on the linen turban. These are sacred garments; so he must bathe himself with water before he puts them on".
The Israel Museum in Jerusalem has done a great job in replicating most of the Priestly garments, they were on display showing all of the garments including the "sacred undergarments".
The Temple Mount Faithful organization also has a very beautiful display of these garments in Jerusalem.
American Pants = British Trousers
American Undergarments/Underwear = British Pants