I am Black and white, so my hair texture is fairly curly, somewhere around 3b-3c. I found that this headband is pretty tight, best worn further back so that the band isn't holding the bulk of your hair down. I think that people with thicker hair may struggle to wear this due to the tightness. I am pretty sure that it was made with straight hair in mind. The band does stretch, but it seems that the quality of the band is high because it takes a decent amount of force to stretch it, leaving it slightly squeezing the head when putting it on.
I also think if you have a bigger head, you definitely would not want to get this.
All of that being said, the fabric is beautiful and the entire thing is very well made. I really love this style and think that is it so beautiful and worth buying. I am sure the band with loosen with a little bit of use.