How to enlarge doily crochet pattern
I need instructions on how to enlarge a vintage crochet doily pattern from 15" to a larger size to go on a cedar chest.
My deceased mother made a doily for my daughter and she is interested in a larger size of same pattern for her cedar chest.
Here is a picture of the doily:
I found one of mother's typed patterns with name of doily and thread company name, no picture. Googled the thread company name and found the doily, it is the same doily she made for my daughter.
Is there a rule of thumb way to increase size?
Your help would be greatly appreciated.