Help understanding weave(s?)

[u/Galvy_01ITA]

Exterior

Interior

Top left, the interior. Top right, the interactions (in green, shared weft; in red, weft that should be shared but that's already used). Bottom right, the exterior.

Hello, I'm not sure this is the right place, but I'll try to explain, sorry if it's not.

I've been struggling to understand the weaving technique/pattern used for my shirt, which has an extremely pleasant feel that I haven't been able to find anywhere and, after analyzing it to identify it, I realized I can't seem to understand how it was made in the first place.

The exterior pattern seems to be alternating 3-1 and 1-1, but it doesn't end up diagonal, so it's not twill. The interior seems to be 2-1-1-2 which, however, doesn't seem to be compatible with the exterior. When touching the fabric it doesn't seem to be two different pieces of cloth, so I don't think it's double. I thought perhaps it was two sets of weft and one warp (if that even is possible) and tried drafting that, but those patterns don't seem compatible even if they shared the warp. Therefore I'm stuck. Is there something I'm missing? Is this even worth asking?

I'll post pictures of the exterior and interior and of my (admittedly poor) attempt to draft the patterns and the failed interaction between them. Again, I'm sorry if this is not the right place.

[u/msnide14]

This looks knit to me. Is it stretchy? 

[u/Galvy_01ITA → u/msnide14]

It stretches only diagonally, being rigid vertically and horizontally. I really know nothing about this, but it doesn't feel like neither a sweater or a polo, so I wouldn't say they're knitted?