Hi,

> \newenvironment{note}{\itshape}{\normalfont}

this is not an answer to your question but the font declarations
may be *used* as environments themselves; so there is no
need for a dummy environment. 
(Moreover, you probably do not want to switch to
normalfont at the end of your environment because the
current font could be something else.)

Try:

\documentclass{article}

\begin{document}
\sffamily
sans serif
\begin{itshape}
  italic
\end{itshape}
sans serif
\end{document}

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