There is a discussion amongst the poskim how (i.e. from where) to measure the size of the beged when there is a slit (v-neck). There is also a machlokes between the Mishnah Berurah and the Chazon Ish how to measure the beged (from the shoulders or from the bottom of the neck hole. Ask your LOR. Regarding cotton and wool: Cotton may be a chiyuv d’Rabbonon while wool is min ha’Torah. Ask your LOR. Rav Yaakov Kaminetsky wore cotton during the week and wool on Shabbos. The Steipler wore cotton always as did the Vilna Gaon. See Maaseh Rav for reasons. The Kitzur Shulchan Aruch, I believe, discusses thick versus thin tzitzis. Asknypur LOR. Few mitzvos are a matter of opinion.
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