This is my take on the free 'Workout Tee' I downloaded from Love Sewing many years ago. I've recently stuck it together and made it up.
Slight downsides, the pattern takes 36 pages to print out and the instructions are in Love Sewing Magazine issue 23 not in the download as is the sizing.
https://blog.fehrtrade.com/inspiration/1064/announcing-the-tessellate-tee-pattern/
This was later developed further by Melissa Fehr to be her Tessellate tee pattern which has extras like a hood and thumb loops and is £8.49
https://shop.fehrtrade.com/products/tessellate-tee
I've made my own cut about tees in the past, so I managed OK without the instructions.
Here's what I did
1. Stick together the pdf pages and cut out the pattern pieces. I went with a size L (more on that later).
2. Cut the upper front, upper back, neckband and two mirror image sleeves out of the the print fabric making sure to keep the right side of the fabric up and the pattern pieces right side up. Everything is cut single layer, with the sleeve piece flipped over for the second sleeve.
3. Cut the side font and side back out of the pink fabric single layer making sure to keep the right side of the fabric up and the pattern pieces right side up.
4. Cut the lower font and lower back out of the black fabric single layer making sure to keep the right side of the fabric up and the pattern pieces right side up.
Note: all the pattern pieces are different, so I was very careful with right sides.
5. I laid the front pieces out together, stitched the black to the pink and then those two to the print. I did the same with the back pieces and then pressed.
6. With some twill tape to secure the shoulder seam I stitched and overlocked the shoulders. I then made up and inserted the neckband following the notches provided.
NOTE: I chose to do all the internal seams stitched and overlocked in ivory.
7. I measured the sleeves and realised they would be too long as drafted so did a 5cm hem instead of the recommended 2cm. I hemmed on the coverhem machine in ivory.
8. I inserted the sleeves flat and sewed up the side seams, carefully lining up the panel seams. I then tried the top on and found the shoulders were too wide and the sleeves still slightly too long. I removed the sleeves, trimmed down the armhole and sleeve cap a bit and reinserted.
9. I rethreaded the coverhem in black and stitched the main hem on the black fabric. I increased the recommended hem from 2cm to 3cm.
10. I gave the top a press and did some photos.