Hi Una --
Again, congratulations on the job and condolences on your friend; so tough to have such divided emotions swirling around.
Because I think you've been running running running for months now to support your friend and the family, get the new job, and take care of your commitments,I'm going to be a little tough love-y and directive. Feel free to ignore....
1) Focus on getting your work clothing together for the 2-3 months, not worrying about what you'll be wearing for the next 5 years. If you can incorporate favorite items/stealth style persona stuff in what you pull together, great. If not, re-evaluate as fall rolls around in light of what you've learning about your environment.
2) You drop a lot at Nordstrom. Make an appointment with a personal stylist, and take anything that may be remotely work appropriate in with you in case she can help you find friends for items you have. If they have suits that work for you, awesome. [You do wear dresses a fair bit, so I wouldn't rule out getting a pantsuit with a matching sheath in there.]
If you didn't have such sad stuff going on with your friend, I'd have no hesitation saying, "Woman, you need to focus! Get a 2-week capsule that makes you look like you embody the qualities for which you were hired and figure out if you can personalize it later!"
So let's pretend all the hard stuff isn't going on -- because to those who don't know you (aka all the new job clients/colleagues) it isn't. And they will be checking you out from every angle...appearance, attitude, work product.
Meanwhile, if you're anything like me you and most you'll be a mix of invigorated and drained (intellectually/emotionally) from the whole starting over thing. You'll be grateful for your capsule, trust me...the control thing YLFers mentioned above will be in play. Plus I bet you'll enjoy the challenge of taking the conservative items in another direction if/when you can.
Good luck!