How to Scale Up a Pattern the Easier Way!

In this post, I'm going to show you the way I scale up gridded patterns.  This is the method I used to make the pattern for the waistcoat, as shown.

(Warning: There is some geometry involved here, as in all pattern scaling, I've just tried to make it as easy as possible to understand)

What you need: A gridded pattern, a ruler, a pen or pencil, lots of scrap paper, an iron, tape.

Step 1:  Trace your necassary pattern pieces on a piece of paper. It doesn't have to be notebook paper, but it hepls you keep a straight line.  Then look at the scale on the pattern (in this case, I think it was 1 square equals 3 inches, we will call the side of the square N, to make the instructions simpler) and draw a grid according to that scale.  If your grid is not correct, the final pattern will either be too big or too small.

Step 2:  Prepare your pattern paper.  This can be any type of thicker paper you want. It's is a very good chance for recycling!  It is preferable to iron it on low heat and get all the wrinkles out.  It works like magic!

Step 3:  On your pattern paper, begin to form a grid.  If your paper has a 90 degree corner, it is easy to start, mark a spot N in. from the bottom of the paper on both sides and in the middle.  If your paper does not have a corner but has a straight bottom edge, measure N away from the bottom at a 90 degree angle and mark it in at least 3 places.  If you have a randomly shaped piece of paper, make a fold near the bottom or draw a line and use it as your bottom edge.

However, instead of drawing lines for the grid (which is very time-consuming), fold the paper like a fan where you would draw the line.  Run a ruler or something heavy and flat over the crease to set it in (I do not recommend using an iron at this stage, because it will get rid of all of the creases).

Continue folding, like a fan.

Once you finish going one way, start the folds going the other way, to form the grid.  The folds should be the same depth (N) going both ways, because the grid needs to be a square. 

Step 4:  Begin scaling up your pattern.  You use the creases you made to guide you, and the good thing about this method is that it takes much less time than actually drawing out a grid.  You also don't have a bunch of pencil lines going across your pattern piece.

After scaling it up, cut it out!

The finished pattern:

Front

Back

Hopefully this helps you have some more sewing creations flying off the needle this summer.  Best wishes!

Rebecca