Menu
MN2208 Dawn / MN2211 Ash / Sewalongs

Ash jeans sewalong: How to choose your size and grade between sizes

How to choose your jeans size and grade between sizes // Ash jeans sewalong on Megan Nielsen Design Diary

If you’re like me, then when you compare your body measurements to the Ash jeans size chart, you might find that your waist and hip measurements fall in two separate sizes. According to my body measurements, my waist is a size 28 and my hip is a size 30. If I cut a straight size 28 I would have a hilarious time trying to squeeze my thighs into my jeans, and vice versa if I cut a straight size 30 I’d be stuck with pants that slid down and fell off all day. Nobody wants that. So what should you do? Today I’m going to show you how to choose the correct size of jeans and blend or grade between sizes for an awesome fit. Let’s do this!

First things first. When choosing your size (in any sewing pattern) it is really important to choose your size based on your actual body measurements, not your perception or expectation of your size based on the size labels, or even based on the finished garment measurements. Always go back to your body measurements.

If you find that your body measurements put you in a size that is different than you expect, please don’t be upset, it’s just a number, and at the end of the day, you are the only one who knows the number and the most important thing is that you make jeans that fit well and are comfortable.

You’ll notice in this pattern that the finished garment measurements include negative ease. This is because this pattern is designed for stretch fabric and as such the finished garment measurements will be smaller than your body measurements.

If you happen to buy a fabric that includes less stretch than the pattern requires, don’t stress out. You can still make this pattern with less stretchy denim – you will just need to size up!

If you’re very lucky you may find that your body measurements land you in one straight size. But for most of us, you will likely find that your waist and the widest part of your lower half (your “hip”) fall into two different sizes. To get the best fit possible you should thoughtfully blend between these sizes, so let’s have a look at how to do that!

How to choose your jeans size and grade between sizes // Ash jeans sewalong on Megan Nielsen Design Diary

First up you’ll need to gather the pattern pieces that require adjustment. You’ll need the waistband, front, back, pocket bag, pocket facing and yoke. You will also need a hip curve ruler, a pen or highlighter and scissors. If you don’t have a hip curve ruler please don’t panic, you can just eyeball it. No one will die.

How to choose your jeans size and grade between sizes // Ash jeans sewalong on Megan Nielsen Design Diary

Cut your waistband to the size that your waist measurement corresponds to. Using myself as the example again, I measure a size 28 in the waist.

How to choose your jeans size and grade between sizes // Ash jeans sewalong on Megan Nielsen Design Diary

For the front pattern piece, cut out the size that corresponds to your hip measurement or the larger size. For me, that is a size 30. On the front pattern piece mark the point where your lower body is the widest. As you know, we call this the “hip” in sewing, and for me is my upper thigh around about the bottom of the crotch seam.

How to choose your jeans size and grade between sizes // Ash jeans sewalong on Megan Nielsen Design Diary
How to choose your jeans size and grade between sizes // Ash jeans sewalong on Megan Nielsen Design Diary

Using your pen draw in the pocket opening and waistline edge for the size that corresponds to your waist measurement (for me this is a size 28).

For the crotch curve, follow the waistline size down the crotch curve until you hit the notch. When you reach the notch draw a curved line from the notch until the mark you placed before.

How to choose your jeans size and grade between sizes // Ash jeans sewalong on Megan Nielsen Design Diary

Cutaway along your lines and you’ve adjusted the waistline and the crotch curve. Let’s move on to the side seam.

How to choose your jeans size and grade between sizes // Ash jeans sewalong on Megan Nielsen Design Diary

At the side seam measure the distance between the hip size and the waist size. For my example, there was a 6mm difference between my hip size (30) and my waist size (28).

How to choose your jeans size and grade between sizes // Ash jeans sewalong on Megan Nielsen Design Diary

Fold the pocket bag in half and then place the pocket facing on top in the correct position.

How to choose your jeans size and grade between sizes // Ash jeans sewalong on Megan Nielsen Design Diary

Place both the pocket bag and pocket facing under the pocket opening in the correct position. At the waistline measure, the difference between your hip and waist sizes and mark it with your pen.

How to choose your jeans size and grade between sizes // Ash jeans sewalong on Megan Nielsen Design Diary

Using a hip curve ruler draw a curved line from the waistline mark to the hip side seam mark. This is your new side seam!

How to choose your jeans size and grade between sizes // Ash jeans sewalong on Megan Nielsen Design Diary

Cut away the excess paper on the front, pocket bag and pocket facing. and you now have your fully graded front pieces. Let’s move on to the back pieces.

How to choose your jeans size and grade between sizes // Ash jeans sewalong on Megan Nielsen Design Diary

As with the front pattern piece cut out the size that corresponds with your hip measurement, or the larger size. Mark on the back pattern piece the point where your lower body is the widest – ie your “hip”. For me, this was in line with the crotch.

How to choose your jeans size and grade between sizes // Ash jeans sewalong on Megan Nielsen Design Diary

At the top of the back pattern piece mark the waistline size along the yoke seam.

How to choose your jeans size and grade between sizes // Ash jeans sewalong on Megan Nielsen Design Diary

For the inner yoke seam mark the waistline size.

For the back crotch, mark along the waistline size until you reach the notch. Once you reach the notch, draw as smooth a curve as you can to meet the hip mark.

How to choose your jeans size and grade between sizes // Ash jeans sewalong on Megan Nielsen Design Diary

For the side seam, overlap the yoke and back pattern pieces by 3cm so that they sit where they will be once sewn with seam allowance.

How to choose your jeans size and grade between sizes // Ash jeans sewalong on Megan Nielsen Design Diary

Remember the measurement we made between the hip size and the waist size? At the waistline on the yoke pattern piece, mark in from the side seam by that amount.

How to choose your jeans size and grade between sizes // Ash jeans sewalong on Megan Nielsen Design Diary

Using your hip curve ruler once more draw a new side seam from the hip mark to the waistline mark on both the back pattern piece and the yoke. Trim away the excess and you now have your amended pattern pieces!

I hope you found this useful! If you have any questions please let me know in the comments!


LOOKING FOR MORE ASH POSTS?

Here’s the full list of Ash posts and tutorials:

We absolutely love seeing what you make, so don’t forget to tag your creations with #MNash and @megannielsenpatterns when sharing on social media, and check out what everyone else is up to!

Briar & Briar Curve

Order Ash today in sizes 0-20 and Curve sizes 14-30

About Author

Meg is the Founder and Creative Director of Megan Nielsen Patterns, and is constantly dreaming up ideas for new sewing patterns and ways to make your sewing journey more enjoyable! She gets really excited about design details and is always trying to add way too many variations to our patterns.

Subscribe
Notify of
guest
4 Comments
Oldest
Newest Most Voted
Inline Feedbacks
View all comments
Martha
Martha
4 years ago

This is really helpful, but I still have a question. Am I correct in assuming that if my waist is 28.5, I should size up to a 29?

Leslie
Leslie
3 years ago

I’m a pretty straight figure… so how would I do it if it’s backwards to these measurements? my hip is a 36 and my waist is closer to a 29. Just pick the size that coordinates with my hips (sz 26) and grade out to the waist (sz 29)… or the other way around?

Laura
Laura
3 years ago

So, how would I grade if I am a size 16 in the waist and a 12 in the hips? Many thanks from an apple shaped person ??

Sandrine
Sandrine
3 years ago

Not sure if these Questions get answered because I don’t see any replie. I’m still a bit lost at the part where it states to calculate the difference between the hip and waistline. Not sure if from picture looks like it’s beingg calculated between the sizes horizontally or vertically and responses to other questions imma 26.5 waist and 38 hips. Does one even upgrade or just try to merge in the 28 and call it a day