
There are many ways to cut a muscle tank top, and it's a great way to upcycle an old T-shirt. The first step is to put on the T-shirt and mark with a fabric marker or chalk where you want to cut. Then, take it off and cut the sleeves, measuring an inch from the shoulder seam and two inches below the bottom seam. You can also eyeball it, but be careful not to cut too deep! Once you've cut the sleeves, try on the tank and see if you're happy with it. If not, you can always trim the edges.
| Characteristics | Values |
|---|---|
| Measuring | Measure 1 inch from the shoulder seam of each sleeve and mark it. Then, 2 inches below the bottom seam of each sleeve and mark it. |
| Cutting | Connect the two dots on each side by drawing a straight line down and then making a slight swoop after passing the bottom seam of the sleeve. |
| Armhole depth | Try the t-shirt on and mark with a fabric marker or chalk where you want the t-shirt to fall once cut and how deep you want the armhole to be. |
| Trimming | Trim the excess fabric if required. |
| Hemming | Hem the armholes if desired. |
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What You'll Learn

Measure and mark the cut lines on the t-shirt
To measure and mark the cut lines on the t-shirt, start by trying it on and marking it with a fabric marker or chalk where you want it to fall once you cut it. Determine how deep you want the armholes to be and mark this too. If you want a looser, muscle shirt look, make the armholes slightly larger.
Then, lay the t-shirt on a flat surface, fold it in half, and match up the side seams so that they are even. This will help you make symmetrical cuts on both sides. You can also use a ruler to ensure straight lines and symmetry.
Now, you can start drawing the cut lines. Using your chalk or fabric marker, trace a curve around each sleeve from the shoulder seam down to the underarm. For a more fitted tank top, follow the seam more closely.
After you have traced the curves, connect the bottom of the curve to the hemline with a straight line. You can also make a slight swoop after you pass the bottom seam of the sleeve. Now, you are ready to start cutting along the lines.
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Cut the sleeves off
To cut the sleeves off a shirt, you'll need to start by laying the shirt out on a flat surface. It's important to measure and mark where you will cut to ensure a neat finish. Using a ruler, measure an inch inward from the shoulder seam of each sleeve and mark it. Then, measure and mark two inches below the bottom seam of each sleeve.
You can now connect the two marks on each side of the shirt by drawing a straight line downward, and then making a slight swoop after passing the bottom seam of the sleeve. This will be your cutting line. It is important to avoid marking a straight diagonal line from the top of the shoulder down to the side of the shirt, as this will create a very large armhole that changes the shape of the shirt.
Now, hold the fabric taut and carefully cut along the line you drew, pulling the fabric tight around the marked area as you cut. Cut as smoothly as you can without stopping to ensure a clean cut. For a neater finish, leave the seams intact when cutting the sleeves off. Alternatively, if you want a more casual look, cut the seams off with the sleeves.
Finally, once the sleeves are off, try on the shirt to ensure the armholes are even. A good way to tell if you've cut off too much fabric is if you're showing skin beneath your bra straps—then you know you've gone too far!
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Cut down the sides
To cut down the sides of a t-shirt to make a muscle tank, you'll first want to try the t-shirt on and mark with a fabric marker or chalk where you want the shirt to fall once you cut it. Determine how deep you want the armholes to be and mark an inch in from the shoulder seam of each sleeve. Then, mark two inches below the bottom seam of each sleeve.
You can then cut down the sides by connecting the two marks on each side of the shirt by drawing a straight line down and making a slight swoop after you pass the bottom seam of the sleeve. You can fold the t-shirt in half and cut both sides at once so they are identical, or cut one side, fold the t-shirt, and use the cut side as a guide for the other side.
Make sure not to cut too deep, as you don't want to show skin beneath your bra or underwear. If this happens, you've likely gone too far. You can also try stretching the ends of the shirt and tying a knot to deepen the cut or trim off any excess material.
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Try on the tank and trim if needed
Trying on your DIY muscle tank before finalising the cut is an important step in the process. Once you've cut the sleeves off your t-shirt, you'll want to try it on to see if you're happy with the fit and cut. This is also a chance to check if the armholes are the desired depth. If you find that the armholes are too shallow, you can trim the edges to deepen the cut.
When trying on your muscle tank, pay attention to the length of the shirt. If it's longer than you'd like, mark the desired length with a fabric marker or chalk. You can then take the shirt off and cut it along the marked line. Folding the shirt in half before cutting can help ensure that both sides are even.
If you're happy with the depth of the armholes and the length of the shirt, you're almost done! The final step is to stretch the ends of the shirt. This will cause them to curl up slightly. You can then tie a knot or simply leave the ends as they are, depending on the style you're going for.
It's important to remember that you can always cut more but you can't undo a cut that's too deep. So, when trimming, go slowly and carefully. It's better to cut less and then trim more if needed.
Now you have a custom muscle tank that's ready to be worn and shown off!
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Stretch and tie off the ends
Now that you've marked how deep you want your armholes to be, it's time to stretch and tie off the ends. Hold down the top and pull on the ends to stretch them. This should make them curl up a little. If you want to add a fringe to the bottom hem, you can do so now. You can also add pony beads to the fringe before knotting the ends.
Once you're happy with the length of the fringe, tie a knot at each end to keep the beads from sliding off. You can add the same number of beads to each tassel, or you can mix it up—for example, some tassels can have two beads, while others can have four. If you want a fancier look, you can knot the tassels together to create a macramé effect.
If you don't want to add a fringe, you can simply tie the ends of the fabric together. To create a high-low effect, fold the top in half so that the side seams are visible, then cut at an angle from the bottom back corner to the front, where you want the shirt to end. Wrap the cut-off hem around the V-shape you've created, then tie the ends together.
Finally, try on your new muscle tank top to check that you're happy with the fit. If you need to, you can trim the edges or deepen the cut. You can also discard the sleeves now if you haven't already.
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Frequently asked questions
First, try on the t-shirt and mark with a fabric marker or chalk where you want the t-shirt to fall once you cut it. Then, measure an inch from the shoulder seam of each sleeve and mark it. Mark two inches below the bottom seam of each sleeve. Connect the two dots on each side by drawing a straight line and then making a slight swoop. Cut the sleeves off and discard them.
Yes, you can fold the t-shirt in half and cut both sides at once. If the material is too thick, cut one side, fold the t-shirt in half, and use the cut side as a guide.
The best way to tell if you've cut off too much is if you're showing skin beneath your bra.











































