One thing to note: when making a sloper, you want to take precise measurements, without any ease added.
The following are needed:
Bust: Taken at the largest point. Make sure the tape measure in straight across your back. Don't pull it tight, but it should be fairly snug. Also, calculate 1/4 of that measurement.
Waist: Taken at the natural waist. I recommend tying a ribbon or string around your waist. Also, calculate 1/4 and 1/10th of that measurement.
Back Length: This might require a helper. Taken from the base of your neck to your natural waist.
Side length 1: From your waist to below the arm. The waist ribbon helps and it might help to tie another ribbon around your, right under the arms.
Side length 2: From the ribbon below your arms to the shoulder. Do not curve the measuring tape, keep it in a straight vertical line.
Shoulder: From the base of your neck to the point of the shoulder.
If you have a significant difference between your left half and your right half (most people's shoulders are not exactly at the same height, but it's usually a slight difference), then you should take measurements on each side, label them as such, and make a separate sloper for each side.
Remember, this is to fit you! Any questions specific to you, feel free to send me a private message or email.
I think that's all. "See" you on Saturday!