Do fishing gears effects stack?

all I know is they do stack but someone said that they don’t. what’s your opinion on this? like for example it would be a waste of slot if I use Pro Fisher Visor Hat and Pro Fisher Suit since they both give the Strike Frequency boost effect

Based on my knowledge and experience fishing gears that give strike frequency boost, strike sensitivity boost and strike time extenders do stack on top of each other. But I’ve never tried stacking reeling boost items or items that lessen fish runs, but Im pretty sure they can be stacked too. And I think that you can’t stack drag boost because the items that give this boost are peg leg pants and rodster sandals and they cannot be worn at the same time.