I was inspired by Gertie's Blog for Better Sewing and her entries on muslins - start with "What's Your Muslin Strategy?" and check out some of the comments as well.
I found a great entry on Sew Craftful's blog titled "How to Make a Sloper." Callie, who is Sew Craftful, offers a lot of great advice and instructions.
I agree with Callie that making a sloper is essential for getting a great fit with vintage patterns. However, I also believe this holds true for sewing with contemporary patterns as well. Though a time consuming project, initially, I believe it is worth it.
You may want to check out these tutorials from Threads Magazine as well:
Drape a Skirt Sloper." This is a very clear and detailed tutorial.
Get the Right Armhole, Fit the Bodice." Not only does this offer good tips on fitting for your body type - with illustrations, it also walks you through applying these tips to making a well-fitting bodice muslin.
Sew Craftful has these tutorials, which should be helpful to the beginning or returning sewer/seamstress:
How to Take Body Measurements
How to Take Measurements Hints and Suggestions
How to Make a Basic Pattern
How to Make a Pattern from an Original Garment
How to Pick a Starter Vintage Sewing Pattern -- These guidelines may be helpful those who want to start with a contemporary pattern as well.
How to Compare a Basic to a Commercial Pattern
The Benefits of Working with a Muslin Mock Up or Test Pattern
I hope these help.
