The humble plain white t-shirt may be the most ubiquitous garment in the world. However, making a really good one is deceptively complex. Everybody wears them, and everybody needs them. Yet few people know the nuanced details that separates a good tee from a great one.
Key details to consider
First, there is the fabric and how it is knit, which affects how the shirt is sewn together. Fabric weight also significantly impacts how long a t-shirt will last. Lighter fabrics offer that soft, lived-in feel of vintage t-shirts but it won’t last nearly as long as a heavyweight tee. That trade-off is completely a matter of preference.

Then, there is the stitching and the neckline, both woefully underappreciated details. For example, a ribbed bound neckline will keep its shape for much longer than a knit-band neckline.
There’s no right or wrong, per se, however these details usually affect both the longevity and price of the finished product.