What's that plant?

These are the very first wildflower I ever learned to recognize.  They only bloom for a week or so but their beautiful foliage stays around until fall.

Hint:  Think clothing.

Extra points if you can name the common garden plant that is a close relative. 
Answer below the fold.


Answer: Dutchman's breeches:   dicentra cucullaria

Bleeding heart [dicentra spectabilis]  is a close relative of dutchman's breeches.