內褲應該是更早就有的，
panty, underpants, scanties 這幾個字的字源都比 1935 年早。

Jockey 官網也說
1878 年轉向男性內衣褲的製作。
1934 Jockey Brief 款示。
1935 Jockey Y-Front (有開口的)

undergarment
First Known Use: 1530
https://www.merriam-webster.com/dictionary/undergarment

underwear
First Known Use: 1870
https://www.merriam-webster.com/dictionary/underwear

panty
First Known Use: 1908
https://www.merriam-webster.com/dictionary/panty

underpants
First Known Use: 1925
https://www.merriam-webster.com/dictionary/underpants

scanties
First Known Use: 1929
https://www.merriam-webster.com/dictionary/scanties

https://www.jockey.com.au/history