This is my method for inserting invisible zips – it’s a bit different to the way dressmaking patterns describe, and I’ve included a few little tips and tricks that (hopefully) make things easier!
Make life easy on yourself and insert your zip as early as possible in your garment assembly. It really is much easier to sew a CB zip into the two back panels only, than to try and sew it into a nearly completed skirt!
Here is my skirt ready for zip insertion – as you can see I have already sewn and overlocked the seam beneath the zip. (I haven’t overlocked the yoke/waistband part as that will be concealed.)
If your fabric is delicate, the stitching at the base of the zip (around the backtack) should be fusetaped
for reinforcement. For this particular fabric (a viscose georgette) I have fusetaped the full length of the zip:
Open your zip and place it on your zip seam so right sides are together – ie, your fabric is face up and your zip is face down. I always use 1cm seam allowances, and as the zip tape is the same width as my seam allowance I just need to line up the edges. The pinked edge of the top of the zip should align with the top cut edge.
Notice how I use an ordinary zip foot? I filed my invisible zip foot in the rubbish bin years ago, as I get much better results with an ordinary one. I can stitch closer to the zip coil – by folding back the coil and stitching in the groove – so you never see the zip from the outside. This way I can also stitch closer to the end of the zip – no more gaps!
When you near the bottom lay your seam allowances open and flat, and fold back the other side so you can clearly locate the exact position of your backtack. Butt the zip coil adjacent to the backtack and stitch right down to this level.
Now you’re halfway there!
Now see how my skirt has a trim along the yoke seam? When the zip is closed, I want the trim on each side to line up. To ensure this, I marked the zip tape level with this seam with a small clip, or you could use a pin:
Then with the zip closed, clip the other side exactly opposite the first clip.
Now when you sew the other side of your zip, ensure that you position your yoke seam at this clip, and voila – they will line up!
Open the zip up again to sew the other side. With the seam allowance open and zip coils butted together, stitch from the bottom up, making sure the nick aligns with the yoke seam, and the upper zip aligns with the upper edge, by the same amount on both sides.
Now slip the zip puller through the little gap at the base of your zip – you can just see it peeking through in the above photo – and zip it up! Check everything aligns – top edge, yoke seam, no bubbles at base of zip – and you’re done!
Now who said invisible zips were tricky?!
Look out for the next step soon – all about finishing the top edge and facing your invisible zip, neatly and all by machine!