JMCDA

You buy ONE pattern = you can make ONE of whatever the pattern is for your own personal use and enjoyment/enlightenment/education... or a FEW of each item as long as they are intended for your own personal use and enjoyment.

For your own personal use and enjoyment and/or education is the key here - the designers are not selling the patterns for you to turn around and create income from them - they are selling you the right to make a copy of the item that they probably put years of hard work, time and creativity into the making of the original.

The purchase price of the pattern is your cost to be allowed to share in their hard work...to be allowed to enjoy their creativity and make whatever they made to enjoy for yourself.

Yes you may give your finished copy away without permission!
Yes, you may sell your finished copy if somewhere down the road you decide that you don't like it, don't need it or for whatever reason it no longer fits into your life (just the same as you can sell or give away any other possession that you own)

However:
Purchasing a pattern with the intention of creating for resale/income and then selling the items you create from the pattern is an infringement of copyright...only the copyright holder has the legal rights and ability to create income from her/his intellectual property.