Questions & Answers about Пришейте пуговицу к пальто.
Пришейте comes from пришить, which means to sew on / attach by sewing. The prefix при- adds the idea of attaching something to something else.
So:
- шить = to sew
- пришить = to sew on, sew onto, attach by sewing
In this sentence, the goal is not just the general action of sewing, but specifically attaching a button to a coat, so пришейте is the natural choice.
The ending -те marks the imperative plural or polite imperative.
So:
- пришей = sew on! (to one person, informal)
- пришейте = sew on! (to several people, or to one person politely)
In instructions, requests, and formal speech, Russian very often uses the -те form.