Dollstown 18yr girl Patterns

I found these measurements for your doll on a website

height 69.6(head+body)
sitting height 35.4
length of arms 21.9
length of hand 6.2
length of foot 8.7
width of shoulder 13.5
circumference of neck 9.35
circumference of bust 26.6
circumference of waist 19.6
circumference of hips 30.3
thigh circumference : 17.1
calf circumference : 12.8
length from crotch to sole : 36.2
foot width : 3.3

I compared them to a 67.5 cm doll by Fairyland, yours is a bit bustier, everything else is "Close"
I recommend on doing a little research. First I'd check out what patterns are out there for that height doll and then see what dolls the pattern fit. Then look up those dolls and compare the measurement with those I gave you.

You can also make her a knit dress, that way it will be stretchy and have a great chance of fitting her.