how to get the curl or wavy you want?

i worked in this field for 8 years. Many new clients ask me"how to get a exact curl or wavy i want?"
i often told them : two ways:
1) send thepicture of curl or wavy you want to your supplier, let them copy them.
this is best way, only your supplier have good technologist, you certainly get a exact copy.
but if the client cannot copy it or often have mistake on curl or wavy.
i suggest you learn some professional word for curl and wavy.
2) tell supplier with right name of curl or wavy.
As usual , your supplier will offer a order form to you. where list some curl or wavy name ,for example:
40 mm - straight
30 mm - body wave
25 mm - light wave
22 mm - medium wave
15 mm - strong wave / loose curl
13 mm - medium curl
10 mm - tight curl
8 mm - loose afro
4 mm - regular afro
2 mm - tight afro
40mm ,30mm ... are professional word of curl or wavy.
by tell them with these information, you will get a exact wavy or curl.