Dena, having lost 2 dogs (not Yorkies) in under a month this past autumn, I completely understand what you're going through. I'm so very very sorry for your loss, and though it's trite, time DOES help a little. Though I freely admit to crying right now.
Two things I wanted to tell you - first, got the clothes, love them all
Second, when you're ready to do something with Natalie's ashes (1 and 2 months later I still can't even look at the urns that ours came back to us in) please search pet memorials (or PM me) and you'll find a wealth of different ways to honor her. There are ceramic urns (with breed or personalized pictures), photo box urns, necklaces that hold a small amount of ashes (this is what I plan on doing) and a lot more.
Please take care and don't let a single person tell you what you're feeling is wrong or exaggerated - they are your feelings are you are entitled to them.
*hugs*
Tara