Just a suggestion, you may want to research your goodwill shops before giving them your business. Not all are not-for-profit charities in the name of good will (this may be important to you).A big example is "Value Village" which is a multi-million dollar company with a pittance of what they make going to charity.

In Canada good places to go (that I trust anyway) are:

Salvation Army
Community Living
Mennonite Clothes Closet

And in the same vein these are who I donate to. I used to have the Diabetes Foundation pick up my donations from my door. I discovered they make very little off selling it to - you guessed it - Value Village who in turn make a tidy profit.

Some larger centres have consignment and vintage clothing ships, but again they are entirely for-profit.