Here’s a free sewing pattern! This is the Core T-Shirt from Closet Core Patterns.
I made the shirt with linen fabric. The pattern calls for fabric with more stretch, but it worked just fine! The only thing I would change if I made it again with similar fabric is enlarging the neckline so it’s easier to slip on and off since the fabric doesn’t stretch. I also found that I had to cut the neckband on the bias. I made the pattern according to my measurements. It’s very flowy and a bit boxy. I think I could size down, but it doesn’t feel too oversized as is.
I hemmed the bottom of the shirt and finished the sleeves using Sweet Red Poppy serger technique from her free dolman shirt tutorial (which is on my list to make).