How to Make a Tank Top

Shortcut Method

1. 1
   Find an existing tank top. Check your closet for an existing tank top that fits well. You can draft your pattern using this tank top as a guide.

   • Keep it simple. Since you're making a basic tank top, you'll need to draft the pattern from another basic tank. Avoid using tank tops that have darts, pleats, draping folds, or other accents.
   • Drafting this pattern will be easier if you work from a woven tank top, but you can use a stretchy knit if necessary.
2. 
   2
   Fold the tank in half. Fold the tank top in half along its vertical center. Place it on top of brown drafting paper, blank newsprint, or another large sheet of paper.

   • Fold the tank top in half along its back so that the front neckline remains visible. It won't matter much while you're making the back pattern piece, but it matters when you draft the front pattern piece.
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3. 
   3
   Add a seam allowance to the outline. Trace around the entire outline of the tank top. Then, draw a second outline around the first, positioning it 1/2 inch (1.25 cm) to the outside.

   • This extra 1/2 inch will become your seam allowance.
   • If you're drafting the pattern from a knit tank but wish to make a woven version, add another 1 inch (2.5 cm) around the perimeter and to the inside of the 1/2 inch (1.25 cm) seam allowance.
     • This is not necessary if you are drafting the pattern to make another knit tank or if you choose to draft from a woven tank.
4. 
   4
   Tuck in the upper back and repeat. Move the folded tank to another section of paper. Carefully fold the back neckline between the straps, then trace around the outline again, adding another 1/2 inch (1.25 cm) seam allowance.

   • In most cases, the back neckline is higher than the front neckline, which is why you'll need two separate pieces. Folding the back neckline into the shirt should make the front neckline visible, thereby allowing you to trace around it.
   • Make sure that the rest of the perimeter remains even after you fold in the neckline. If folding the neckline distorts the rest of the tank outline, unfold it again while tracing around the remainder of the outline.
5. 5
   Cut out the pattern pieces. Use scissors to carefully cut out both pattern pieces (including the seam allowances). Label the pieces "Back" and "Front" respectively.

   • It may also be a good idea to mark where the fold sits on each pattern piece.
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Conventional Method

1. 1
   Take your measurements. To draft a pattern from scratch, you'll need to know the size of your bust/chest measurement, armhole depth, neck depth, and neck width. You'll also need to know your desired length.

   • To measure your bust/chest , wrap the measuring tape around the widest part of your bust (women) or chest (men). Keep the tape taut and parallel to the ground. If you'd prefer a slightly loose tank top, add 1 inch (2.5 cm) to this measurement; otherwise, use the measurement exactly as it is.
   • To measure your armhole depth, draw the measuring tape from the top outside edge of the shoulder down to the center of the armpit. ^[1]
   • To measure your neck depth, place the measuring tape at the collarbone, directly where the shoulder and neck seams meet on your shirt. Measure down at an angle to the middle of your bust line or chest line.
   • To measure your neck width, wrap the measuring tape around your entire neck, keeping it parallel to the ground without making it too tight. Divide this measurement in half.
   • To measure your desired length, measure from the top of your shoulder down to the waistband of your pants or whichever spot you'd like the tank to reach. Keep your back as straight as possible while taking this measurement.
2. 
   2
   Sketch the front outline. Draw a rectangle with a height matching your desired length and a width matching half your bust/chest size. You'll draft the front pattern piece within this rectangle.

   • To create the neck opening:
     • Start at the top left corner and measure down to the length of your neck depth. Mark this point.
     • Start at the top left corner and measure across to a point equal to half of your neck width, plus 1 inch (2.5 cm). Mark this point.
     • Draw a curved line along between these two points. This line will be your neckline; erase or disregard the portion of rectangle lying to the upper left of this new line.
   • To create the armhole:
     • Start at the upper end of the neckline and measure 2 to 3 inches (5 to 8 cm) along the top, depending on how wide you want the straps to be. Mark this point.
     • Start in the upper right corner of the rectangle and measure down to a point matching your armhole depth. Mark this point.
     • Draw a curved line between these two points. This will be your armhole; erase or disregard the portion of rectangle lying to the upper right of this new line.
   • After completing the outline of the tank, draw a second outline around the first, placing it 1/2 inch (1.25 cm) to the outside. This will be your seam allowance.
3. 
   3
   Sketch the back outline. On a clean piece of drafting paper, draw another rectangle with a height matching your desired length and a width matching half your bust/chest size. You'll draft the back pattern piece within this rectangle.

   • To create the neck opening:
     • Start at the top left corner and measure down 2 to 3 inches (5 to 8 cm) depending on how high you want the back neckline to be. (Note that the back neckline is usually higher than the front neckline.) Mark this point.
     • Start at the top left corner and measure across to a point equal to half your neck width, plus 1 inch (2.5 cm). Mark this point.
     • Draw a curved line between both of these points. This line will be the neckline for your back pattern piece; erase or disregard the remaining portion of rectangle lying to the upper left of the new line.
   • Create the armhole measurement by following the same procedure used for the front pattern piece.
   • Sketch a seam allowance of 1/2 inch (1.25 cm) around the finished outline.
4. 4
   Cut out both pattern pieces. Use scissors to cut out both pattern pieces along the outside perimeter of your seam allowances. Label the pieces "Front" and "Back" accordingly.

   • You should also mark the fold line of both pieces. This line lies to the left side of the pattern, beneath the neckline and on the side opposite the armhole.
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