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I am trying to italicize one section in my title in the tufte-latex class. \textit does not work. \itshape and then \upshape works:
Non Italic \itshape Italicized Part \upshape Non Italic
But this is causing "Italicized Part" in the title used as the running header in the text pages to become lowercase. What am I doing wrong?
Piggybacking on WillAdams' answer, you'll also need to use a typeface that provides italic small caps. Linux Libertine and Minion Pro are a couple such typefaces:
\documentclass{tufte-book}
\title{Non Italic \protect\textit{Italicized} Part Non Italic}
\author[The Tufte-LaTeX Developers]{The Tufte-LaTeX\ Developers}
\publisher{Publisher of This Book}
\usepackage{lipsum}
% Use Linux Libertine as the main text font
\usepackage{fontspec}
\setmainfont[Mapping=tex-text,Numbers=OldStyle]{Linux Libertine O}
\renewcommand\allcapsspacing[1]{{\addfontfeature{LetterSpace=15}#1}}
\renewcommand\smallcapsspacing[1]{{\addfontfeature{LetterSpace=10}#1}}
\begin{document}
\maketitle
% Test that we have italic small caps
\itshape italic \scshape small caps \normalfont
Test\clearpage
pages
\end{document}
The problem is that the running heads are set as small caps.
\documentclass{tufte-book}
\title{Non Italic \protect\textit{Italicized} Part Non Italic}
\author[The Tufte-LaTeX Developers]{The Tufte-LaTeX\ Developers}
\publisher{Publisher of This Book}
\usepackage{lipsum}
\begin{document}
\maketitle
Test\clearpage
pages
\end{document}
You'll need to re-define the running head command so that it marks that one is w/in such an environment, then define an emphasis command which checks to see if it's w/in a running head and when it is, applies \textsc --- alternately, Memoir includes a tufte-inspired appearance, it may be better behaved --- it's certainly more thoroughly documented.
Non Italic \textit{Italicized Part} Non Italic