What's the weather like where you live? And are you looking for things you can continue to wear?

If it's cold there, it should be easy to find pullover sweaters and cotton knits with any style neck you like (including turtlenecks), just go for the more subdued colors.

If you're not planning for this to be a permanent style change but still want to wear these clothes later, you might consider something like blouse inserts or women's Dickey's, which can be worn underneath a top that you wish was more modest (perhaps even one you own now), and which you can simply stop wearing when you decide it's time.

And obviously, I'm sorry for your loss.