I left off last week thinking that this week’s post would need to be all about truing up our newly created patterns. It seemed then, as I wrote that piece on creating a block / sloper from a commercial clothing pattern, that the idea of truing up our patterns was coming across as being quite complicated. I even got some emails about it! So, this week I’m gonna clear up the confusion. You see, truing up your pattern pieces isn’t as hard as it seems. Honest! 🙂
What Do We Mean When We Say Truing Up?
Truing up is the term used to make sure things match up. It might well be a dart and you’re checking that each dart leg is the same measurement, or it might be an adjusted seam line that now needs to be checked so that it matches it’s other half, or it may even be that an adjusted pattern piece now has smooth lines once modified.
‘Truing up’ then is the process of making sure things match up how they are supposed to.
What is A True Line?
A true line is a tidy line which will give us the outcome we want in our fashion creations. This image below is of an armhole being trued up during my ‘Create Your Own Clothes’ series.
You can see from the photo that when I closed the dart in the armhole, the two sides of armhole don’t ‘true up’. There is a step. If we were to leave this as it is, it would end up being quite an unattractively shaped armhole. Or if the dart were sewn in such a way that the armhole edged were meeting, we would have a ‘gather’ of some sort on the one side of the dart. THAT wasn’t part of the design! 😉 In the photo below, you can see that the difference has been corrected. This pattern piece has now been ‘trued up’.
This is how you would true up a dart. But you will also need to true up other elements of a pattern if you are adjusting a pattern’s size or design.
2 Ways to Adjust A Pattern’s Size
One thing to be aware of. There are different ways to adjust a pattern’s size. You can grade it properly – which means to make it bigger or smaller all over, using set measurements for each size graded. Or, you can make it up yourself.
As an example, you may have a pair of trousers that are too long in the leg for you. You plan to modify the pattern to shorten the length and do this by taking out an inch in the front leg pattern and again on the back leg pattern. When you do this, you need to ensure two things.
- The grain line is a straight line still when the process is complete.
- The pattern pieces have been trued up to make sure that there are no issues when it comes to sewing the trousers together.
Checking Other Pattern Elements
There are several ways to check other pattern elements that need truing up.
- Walk patterns
- Measure patterns
To check that pattern elements are correct, we can ‘walk’ them. Say what??? Yep. If we were checking the inside leg of a pair of pants / trousers we would lie the back inside leg on the work table in front of us, and pop a weight of some sort on top, so that the pattern piece doesn’t shift. Then we take the front leg, and pop the crotch point of the front leg to meet with the crotch point of the back leg. They should lie flat on top of each other.
Very carefully and slowly – this isn’t a rush job – we walk the front pattern along the back pattern, making sure that we are matching the seam lines, NOT the seam allowance edge!
Now, there is often ease adding to certain areas of patterns where stress can occur – this is to stop the garment from ripping when we put them under that stress. The trouser legs have a touch of ease added. So, this needs to be born in mind when you are walking your patterns! 🙂
If you aren’t so sure about walking your patterns – lack of space can limit this if you only have a small desk to work at like myself currently – then you can use the edge of your tape measure to check the seam measurements.
You can see from the photo above that I am using the tape measure ON IT’S EDGE! This is essential! We don’t work with flat tape measures when truing up patterns!
You would do this for every seam that needs to be trued up and note down the measurements next to that seam. Again, don’t forget to add any ease that might be on one of the seams.
Truing Up Draped Patterns
If you have draped directly onto a body or dress stand, you need to consider how you will true up the drape.
- Most importantly is marking in both the straight grain line and the crossgrain too before the draped fabric is taken of the model / dress stand.
- Be sure to mark in the centre front and centre back too before removing from the model / dress stand.
- At this point, you could either continue truing up on the stand, or, if you have pins, basting stitches and pen marks in place you could also take the drape off and true up your pattern on the flat.
Seams That Need A Little Ease
Ease is the extra ‘amount’ added to patterns for comfort. When it comes to truing a pattern though, we consider ease within seams, not the ease added for the overall fit of a garment.
- Outer leg seam. There is usually a centimetre ease added to the back trouser pattern around the high thigh point. This is to help the fabric as it strains over our legs when we sit or lunge, and lessens the possibility of it ripping.
- Inner leg seam. Some designers also add a little ease to the back inside leg seam for the same reason.
- Shoulder line. There is always a little ease added to the back shoulder. This helps the fabric work round the shoulder, and let the front nicely.
- Sleeve cap. In order for a sleeve to fit nicely inside the armscye / armhole, and not looking flat, there is often ease added to the sleeve cap of the sleeve, between the front and back notches.
- Elbow. There is often a little ease also added to the back sleeve pattern around the elbow area. This is again to allow any strain on the fabric to not pull or rip the seam.
Now Get Truing!
That’s it. See, truing patterns is not as complicated as it sounded last week right? If you have any other questions, don’t forget to hit me up with them in the comments below, or via email. You know I always reply!
Til next time…
RECOMMENDED READING: If you loved this post on Truing Patterns, why not check out last week’s post on developing a personal block or sloper from a commercial clothing pattern? Or part one in the Pattern Making series: The Process of Making Your Own Patterns!
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