I'm sure there are a thousand tutorials on the net explaining how to do this - but I thought 'hey, whats one more!'. So here is my way of doing Hong Kong Seam Binding. I treat this process as 'sewing preparation' just like cutting out, marking things, and sewing darts. I get it over and done with before I start construction.
1. Cut out all the pattern pieces required for your pattern
Pretty obvious really, I know. Cut them all out and mark whatever you need to mark.
2. Cut the bias tape to length
Take the first pattern piece off your pile and measure the bias tape against the edge you want to bind. I cut mine so I have about an inch extra on each end just in case...
3. Iron one fold of the bias tape open
I would buy single fold bias tape if I could, but I can't. If you can, go for it, and skip this step!
4. Sew ironed flat side of bias tape to wrong side of fabric
Line up the bias tape and the fabric, and then sew a line of stitching half way between the edge of the bias tape and the fold line you just flattened. Don't forget to leave a piece overhanging at the start!
5. Iron the bias tape over to the right side
With the fabric right side down on the ironing board, iron the bias tape so it folds over the line of stitching you just did, and protrudes past the edge of your fabric piece
6. Turn the fabric over so its ride side up, and iron the bias tape down
With the fabric right side up, fold the bias tape over so it snuggly covers the edge of the fabric, and iron it down to make a crease.
7. Sew the bias tape to the fabric
Run a line of stitching down the bias tape near the edge of the tape, encasing the raw edge of the fabric. Cut off the bits of bias tape that protrude from each end. You don't need them now.
8. Celebrate, cause you've bound one edge
Repeat ad nauseum until you've bound all the edges that need binding
When you've bound all the edges, then you can start constructing your garment. And when you iron the seams open, they will look like this:
NOTE: I've been thinking about darts - should I bind the edge before or after I do the darts? And I've decided I should do it after. And on thick fabrics like this wool in the pictures, I will be trimming the dart to reduce the bulk.
Any questions? Ask away!