Well you have 10 slots on your 'main' character so you can store 10 patterns there and then if you want to have more then 10 patterns create 1-3 characters which are usually called 'pattern holders'
Then you have to do the same thing with sable (talk to her for 10 days) and if you have 2 characters (including your mayor) you have 20 patterns with 3, 30 patterns and with 4, 40 patterns and you can only have 4 characters I have 29 patterns and a fourth character which I do not know what to do with yet?
Oh and I am guessing you visited my dream town? Seeming you have not come to my town yet? And if you did thank you!
Thanks Cutiepiecat <3