If you’ve made our new Ingrid pattern, you will quickly realize that it could easily be adapted to be a sports bra. One thing it lacks however is a back typical of sports bras – a racer back. These backs are often called Y-backs or sports backs, but with slight variation they are all the same. This one has a keyhole finished with fold-over elastic and a hook and eye closure for adjustability. Here’s how to make a Racer Back Ingrid for your next run.
Start with the basic Ingrid back pattern.
We have to allow for the space the hook and eye actually takes up on the back, so reduce the length by 1″ (2.5 cm). The typical hook and eye uses up approximately 2″ of space when fastened on the tightest hook.
Next, add a line for the centre back that runs along the original centre back.
Now it’s time to calculate the height of the hook and eye and where to draw the circle. This is what it will look like but, how did we determine that?
Mark along the edge the height of the bottom band elastic. On top of that elastic, lay the hook and eye you are going to use. At the top of the hook and eye, is the place to start the keyhole back. The top of the original back is a fine place to end the top of the keyhole.Next, draw the extension for the strap. It should extend out from the centre back line and move out a couple of inches. The other side of the strap extension curves back down to the side seam.
How wide do we make that back strap width? As wide as your planned strap elastic PLUS 3/8″ (9 mm) for the top band elastic.
Here is our finished draft. Finish the keyhole and the top of the Y-back with fold-over elastic binding. It is easy to sew on, especially if you use a glue stick to help you!
And here is our finished Racer Back Ingrid.
(Couldn’t resist showing you the front as well)