Materials:
1) 1 skein of T-shirt yarn 0.3 - 0.4 (7-9 mm) wide. (I used T-shirt yarn (120-140 m, 420-440 g), made in Ukraine by @confetti_pryazha)
You can crochet from any thick yarn - acrylic, wool. The size of the pillow from the yarn change may vary. In the tutorial, a variant of crocheting a pillow from T-shirt yarn is proposed.

The pillow has dimensions:
Width – 13 inches (33 cm)
Length – 12 inches (31 cm)
Height – 6 ½ - 7 inches (17-18 cm).

2) Polyester filler (holofiber) – 200 – 300 g
3) Fabric in the color of the yarn (cut 50x100 cm)

Tools:
1) Hook number 8
2) Sewing needle
3) Sewing threads
4) Scissors