The main yarn is a cotton slub, with beige and russett plain pearl cotton stripes with a "V" dip in the centre. back and front alike.
Other summer tops in cotton include...
Lacy top in ginger cotton:
...with detail of the stitch:
Another top is in grey, pink and blue marled yarns, with the pattern on the body continuing on the sleeves:
The next top is in a pale turquoise and white cotton slub, with texture from garter stitch stripes and cable panels: