These are my favourite tights from the Henry Holland collection, the mock stocking effect is really novel and makes a nice change from plain black opaques. They're £10 from Tightsplease and they also come in pink, blue and purple.

Wear them with a longer skirt and only you will know you're sporting these special tights, but the most fun is to be had from giving them a flash. A flouncy mini will show off the stocking effect and what's more the opaque section carries on around the waist and hips, so there's no chance of flashing your pants! You can also have fun with these tights by wearing them with a mini, and layering a slightly longer sheer overskirt.