YOU SAID:
I'm 8 inches and thick
INTO JAPANESE
私は8インチで厚いです
BACK INTO ENGLISH
I'm 8 inches thick
INTO JAPANESE
私の太さは8インチです
BACK INTO ENGLISH
my thickness is 8 inches
INTO JAPANESE
私の厚さは8インチです
BACK INTO ENGLISH
my thickness is 8 inches
You've done this before, haven't you.