There is no rule you can only have two though, just saying. More than one per person can be quite nice, especially in winter.
But the crazy thing is that every single goddamn store that sells bedding, will sell you solutions to your problem. It's not like you go to one store for single-person beds and their matching single-person bedding, and then a different store for double beds with matching double bedding. No, the same store that sells pillows and sheets and blankets sells them in different sizes and you can mix and match as you please.