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Looks like love -- and Taylor Swift -- is great for merch sales ... 'cause TMZ Sports is told Travis Kelce 's jerseys flew off the shelves on Tuesday after he proposed to the pop star!

Fanatics -- the official e-commerce partner of both the NFL and the Kansas City Chiefs -- said to us in a statement on Wednesday Kelce's jersey sales spiked 200% from Monday to Tuesday.

They added the tight end's big day was his best-selling one since Super Bowl LIX -- which occurred in early February.

The surge, of course, should not surprise many ... especially considering Kelce and Swift's announcement of their engagement temporarily crashed Instagram . Getty

It seems everyone wants a piece of the couple and things associated with them now that they're set to wed -- w

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