Sally Jupiter Costume (Silk Spectre I) from Watchmen

Step 5 Pinning the correct sides together.

This is where spacial dyslexia will get you in trouble! 
Decide which side you want to be shown on the final product, right side or wrong side.  On my fabric, the "right" side was shinieer, and I wanted that side to be the finished product on every black piece but the central section of the belt (the part behind the laces, to accentuate them). 
If you want the "right" side to be the outside, pin it as follows [Wrong side out] + [Wrong side out] + interfacing.  Or, if this is easier to understand, place right side against right side and line the interfacing up against either side.

I did this for the neck., the wristlet, and the four wrap-around sections of the belt.  I did the opposite for the central section of the belt.