Foggles . . . better than nothing, decent for practice, but not really the same as being in the soup.
I bought a $2 pair of Visitor Safety Glasses from the local industrial supply house, designed to fit over glasses. They fit nicely over my sunglasses for practice approaches, currency, etc., and I used them for my private and instrument checkrides.
Sit in the plane with the seat in the flying position. Draw the outline of the panel edges on the outside of the glasses with a marker. Mask off the portion below the line on the INSIDE of the glasses with masking tape, then sandblast the INSIDE of the glasses. Presto! Instant IMC when you wear them.
The commercial foggles are textured on the outside, which means every scratch creates a blinding amount of light when you turn across the sun. Texturing the inside protects the surface from scratches.
I keep mine in a Crown Royal bag, turned inside out, cut off and sewn to length. Pax get a kick out of seeing them in the seat back pocket, the purple bags are quite recognizable.