Loud! Busy! Pink!
These are all things that describe these mens' pajama pants. They're clearly meant to be retro, mimicing the loud & often overly busy style of 1990s Sonic items. However, why they chose pink as the background is anyone's guess. Some nicely done/chosen Sonic stock arts are scattered around, along with his classic styled name, and parts of floating platforms, palms and 'sunflowers' from Green Hill Zone as well as sparkles. But, ALL of these items clash terribly with the pink background. The pink is even described as being 'neon colored' which...likely doesn't help much.

You can buy these for 12.99 Pound at NewLook.co.uk in winter 2010. They're all cotton, and they do list 'for men' but really they're sleep-pants and anyone can wear them with the elastic waist. Certainly, they'll stand out in any Sonic collection. 

Discovered by David Baker