V-Shaped Tubular Gusset. I searched your image using Google lens on my phone.
Female Fashion Advice
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I just downloaded Lens based on this comment and now I can't stop playing with it. I feel like a wizard!
You can also use it without the app by requesting the desktop site for www.google.com then clicking on the 📷 icon
Also is on android phone search. Best use is foreign menus, will auto translate items. My kid showed me, it's bloody amazing.
Interesting way to phrase that
The shirt is a tubular tee shirt, and the v-shaped insert is called a gusset XD
it’s not really a gusset, because it’s not entered at the seam
Looks like it has a few names =)
https://www.gearpatrol.com/style/a718568/sweatshirt-v-insert/
This is one of those questions that I didn't ever think to ask but glad I know the answer to now.
I had the most success when using the terminology from this article, thanks! "V-notch insert" mostly worked (although I think it's just not a thing people really mention when describing sweaters.)
I really enjoyed reading that page, so thank you for finding and sharing it!
Asymmetrical
I asked chat gpt and apparently it is also known as a "sweat patch". Its functional purpose is to absorb sweat that accumulates around that area of the chest.
A crime
Often see these on waffle knit sweatshirts or heavyweight shirts, high GSM. Heavyweight shirts frequently have unique seams and stitches to keep their shape and strength despite the heavy material.