This colour is close to Royal but darker than mid blue!!
 
Plain poly cottons are a firm favourite with many uses from various craft work to dress making, baby wear, bunting, fancy dress stage and theatrical work and soft furnishing such as nursery curtains, crib or cot covers.  
The weight of this fabric is approximately 100gsm
Composition is 65% polyester and 35% cotton
Width: 112cm
Note: This product is sold by the metre 😊