YOU SAID:

There’s a pair of pants and says that we need to try on actually

INTO JAPANESE

ズボンがあり、実際に試着する必要があると言っています

BACK INTO ENGLISH

He says he has trousers and needs to actually try them on

INTO JAPANESE

彼はズボンを持っていて、実際に試着する必要があると言います

BACK INTO ENGLISH

He says he has trousers and needs to actually try them on