
Okay, let’s begin to design!
Step 1: Choosing your layout
For this first lesson, we’ll choose the simplest layout of all: rectangles joined together to make a sweater. This is also sometimes called a modular design since it uses different geometrical shapes to achieve the end result. Examples of modular design pieces on my blog are: Vintage Cardigan, Openwork Jacket, Bog Jacket, Draped Sleeveless Jacket, and Side-To-Side Jacket. In the illustration below you can see the 3 different shapes we’ll need for this design.

Step 2: Choosing Your Hook And Yarn
Since the modular design is inherently boxy in shape, you can either play this up by using a thick yarn and a small hook or you can have wonderful drape by using a thinner yarn and larger hook. Play around with a few stitch patterns that are easy for you and that will give you the look you desire. A more open pattern will allow for more drape while a tighter pattern will make the sweater warmer and more suitable as an outer garment.
Step 3: Making Your Drawing
You do not have to be an artist to design your own clothing. Simply make a rough sketch of how you want the sweater to look when finished. For our purposes in this first lesson, we’ll stick with the easiest configuration. In the drawing below, you see how I’ve assembled the basic rectangles to make the shape of a sweater.

Step 4: Determine Your Measurements
Determining your measurements for this project is easy. You can simply measure another sweater that you have that has the fit that you desire. Or you can go by another crochet pattern that gives you a schematic of your pieces. You can also measure yourself and write down the following:
Bust and Hips:
Length of Back and Front:
Length of Sleeve
Height of Sleeve
These are the only measurements you need for this modular design. Remember that this is a boxy design and you will want to add a few inches of ease to enable the sweater to hang properly. If you prefer a more fitted design, we will cover that in future lessons. This time we will stick to the modular method. Your ease should be anywhere from 3 to 6 inches around your bust and hips. Again, you are probably aware of what makes you comfortable when it comes to fit so you might already know this measurement. For instance, if you have a size 36″ bust and hips, you might want your sweater to measure 40″ around.
Step 5: Make A Gauge Swatch
This is a great thing to do when you are watching TV in the evening. Assemble your chosen yarn, hook, a pen and notepad, a ruler, and a calculator next to your chair. I recommend that you also bring along a hook one size larger than the one you are going to use. This will be for your starting chain. I can’t tell you how many times I could have avoided gauge problems by making the starting chain looser. With your larger hook, make a chain of about 30 or however many you will need for your stitch pattern. Switch to your smaller hook and crochet a square. Measure to see how many stitches are in 4 “. Write this on your notepad. Then measure the rows to see how many are in 4″. Write this down. Now, what I usually do is grab my calculator and divide those figures out to see how many stitches = 1″ and how many rows = 1″. For example, if you came up with 16 stitches = 4″, then you know that 4 stitches = 1″. Sometimes you will come up with a fraction. Write these figures on your notepad.
Step 6: Planning Your Dimensions
Now that you know how many stitches and rows = 1″, you can determine how many stitches and rows you will need to make your sweater.
Back: The back is 1/2 the width of the front so you will divide your bust and hip measurement by 2 and get a number. Write this down. Multiply this number by the number of stitches per inch in your gauge calculation. Write this down. This is how many stitches you will need to make your back width. Now, multiply your rows per inch by the length you want your sweater to be. Write this down. This figure is how many rows you will have to make to make your sweater the right length.
Fronts: You must leave about 3″-5″ between your two front pieces for your neck. You already know how many rows you must make to get your length. Divide your back measurement in half. Let’s say you are leaving 3″ open for the neck. Subtract 1.5″ . For example: if your back measures 20″, divide this in half to get 10″. Now subtract 1.5″ and get 8.5″. This is the width that each front piece must be. Write this down.
Sleeves: Since your back and front pieces do not have an armhole cut-out in this design, the shoulders will drape over the top of the arm by about 2″. Therefore, you will subtract 2″ from your total sleeve length. Write this measurement down. You can have your sleeve height be any figure you want but if you make it too high then your wrist area will be like a kimono sleeve. A good measurement for sleeve height is about 8″. Since you are making the front and the back of the sleeve all at once, you will double this for 16″. Write this down. So now you know your sleeve length and width. multiply the width in inches by your stitches per inch and write this down. Multiply your length in inches by your rows per inch and write this down.
Step 7: Finishing Your Schematic
Go back to your sketch and write your measurements for the length and width of each piece below each pattern piece. Then write the number of stitches and rows that correspond to each measurement. You now have a completed design for a sweater that you have formulated yourself.

In the above schematic, the length of the back and fronts should read 120 rows. This schematic is based on 16 stitches = 4″ and 20 rows = 4″. This is just an example. Yours will look different because your measurements and gauges will be different.
Next time, we’ll explore some of the many ways that modular clothing can be designed.
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