Thought I would update this. I finally found a modest 100% cotton Temple dress. Found it at Dressed In White. This is it:
https://www.dressedinwhite.com/www/product.do?pid=1047
I have ordered it and should be receiving it in about another week. After looking all over for one, then looking at patterns and fabrics, I was so happy to find one that costs pretty much what I would have had to spend on fabric, pattern and a seamstress.
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Looking back on things, the view always improves.
Impollutable Pogo (1970)
I'll tell you, son, the minority got us out-numbered! ~ Congersman Frog
(Walt Kelly's Pogoism's)