Taylor Swift -- Decked Out in Hardcore BDSM Gear for 'Bad Blood' Video

Taylor Swift was deep into the world of bondage and discipline when she shot her new music video.

Taylor's outfits are deceiving ... they don't look especially edgy, but we found out they were pulled off the rack at a store specializing in racks ... the BDSM variety. It's all courtesy of The Stockroom, a well-known, hardcore fetish store in the Silverlake area of L.A.

We're told Taylor's people scooped up $13,000 in fetish clothing for the shoot, on the promise they'd end up buying 25% of what they pulled. That's a big give, because the store generally doesn't loan out its merchandise on such a large scale, but after all ... it's T-Swift.

Now here's the big bonus. If Taylor's people don't buy the whole lot, the store will be able to resell fetish duds that have Taylor Swift's scent all over them.

Better for business if the stuff isn't dry cleaned before it's returned.