Install
You use your fingers to take down the old flag and install a new one. Flags get old, just like computers and furniture and people. So when one gets too old, you have to get on up there and install a new one in its place.
Imagine reaching out and grabbing onto the old flag with your fingers. Feel the dirty grime and little holes it's gotten. Now install something new!
きょ
す
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You've decided to install a suit (す) where the old flag used to be. I mean, a suit is probably more durable than a flag, am I right? This way you won't have to install flags as often.
Picture a newly installed suit flying in the air on a pole.