Hello!
It's good to be able to add my voice to the chorus of such enthusiastic and devoted collectors.
My own collecting interest--and the thing that has me going to thrifts--is the work of the American fashion designer Alexander Julian.
While many remember him for his "Colours by Alexander Julian" lines, it is actually his far lesser known Couture (aka "Bespoke", or as Alex himself calls it, "Collection") line which is of greatest interest to me.
Here's a pic of nearly all of the labels from his Couture output:

If you should encounter any pieces bearing any of these labels, I'd love to hear from you, as I'm sure to be interested.
For anyone wanting to go down the rabbit-hole, into the Julian labelling universe, I've prepared a fairly exhaustive explanation, which you can find here:
http://www.vintagefashionguild.org/component/option,com_alphacontent/section,6/cat,59/task,view/id,1273/Itemid,100/Happy thrifting!