Who nicks knickers???

I went into Next on my way home. I bought a couple if pairs of knickers. As I left the store, the security alarm beeped. Can't be me I thought - though I did indulge in the in out in out dance to see if it was me setting it off. And yes it was. Perplexed I offered my bag to a nearby assistant who promptly whisked it away to be investigated. Sure enough, Next are now putting security tags on their ladies knickers! Now come on - they are not diamond encrusted! At two pairs for £10 they are hardly worth that surely. Whatever Next???