Where can I get a Christmas duvet cover for a teenager

[Overseasmom100]

So I want something bright colourful but not babyish. Saw this www.marksandspencer.com/christmas-fairisle-bedding-set/p/p60286202
But reviews say it's very stiff even after washing so not cosy. Need a double size.

Any suggestions???

I was quite tempted by this for my son.