Set sometime after World War 2. I know these look like boxer briefs or trunks in some pics BUT, I don't think they had boxer-briefs or trunks during this time period. Which means they are this time periods tighty whities by my logic. Reader suggested.
Colored brief weds is a request from Tao (who also pointed it out). Embarrassment scene with two girls pantsing the guy for the jocks amusement. Don't worry, he gets revenge (unfortunately it doesn't involve pantsing).