2.5mm or 3.0mm crochet and cotton thread will do. Taobao has many doll bags, so you can consider buying them directly. Materials and tutorials in one step. Learn to find other styles and learn by yourself later.

1, 4 strands of cotton thread are suitable for 3-4 mm needles, and are suitable for more durable baby clothes, thick socks and light tops.

2, 1-3 strands of wool are suitable for needles with a thickness of 2-3.5 mm, so the matching fabric is suitable for lace, personal baby products, socks and gloves.

3.3.5-4.5 mm needles can be used when knitting wool together. Generally speaking, this skill of weaving two kinds of wool together requires four strands of spun wool. This kind of knitting is mostly used for clothing knitting, and the knitting speed is fast.

4. Twist sweaters (or Aran sweaters) mostly use needles with specifications of 4-5.5 mm. Aran or twist sweaters originated from seamen's sweaters. Mainly because these sailors and fishermen need a warm fabric when they work at sea, twist sweaters can meet this demand. The thickness of this sweater thread is mostly between double knitting and single thick thread.

5. Chunky single yarn is suitable for 5.5-7 mm needles and outdoor fabrics, such as thick sweaters in winter. Single thick thread is very suitable for weaving large fabrics.

6. Single-strand ultra-chunky is suitable for 7- 12mm needles, and is suitable for weaving indoor articles, such as blankets and sofa cover. It is also suitable for novices and can get finished products quickly.

7. Other super thick threads are suitable for 9- 12mm needles and fabrics with special visual effects, such as scarves, coats and blankets.