Our recommendations:
To the width of your bed, add the height to the floor twice and you will be able to calculate the ideal length of the plaid.
The measurements do NOT include the 10cm of fringes for the fringed quilts.
For PLAID
Bed _90cm: 140x200cm
Bed 105cm: 140x220cm
Bed 135cm: 140x240cm
Bed 140cm: 140x240cm
Bed 150cm: 140x260cm
Bed 160cm: 140x260cm
Bed 180cm: 140x280cm
Bed 200cm: 140x310cm
For BEDSPREAD
Bed _90cm: 220x280cm
Bed 105cm: 220x280cm
Bed 135cm: 240x280cm
Bed 140cm: 240x280cm
Bed 150cm: 260x280cm
Bed 160cm: 260x280cm
Bed180cm: 280x280cm
Bed 200cm: 320x320cm