Here's the fast and easy solution to holding your fabric together without the need for pins! It's Sewline'sFabric Glue Pen. You get the pen already filled with one blue-colored stick plus one extra glue stick refill that dries clear and is water soluble.
Get more Fabric Glue Pen Refills in flourescent yellow or blue.
NOTE: Sewlinerecommends you test your glue on a swatch of your project fabric to be sure it reacts satisfactorily.