There seems to be some misunderstanding/machlokes (disagreement) on how you should wear your tzitzis - with the strings sticking out or tucked in. What's the proper way?
An interesting thread about the subject can be found here : Why do some people wear their tzitzis out for people to see, and others don't?
The Mishna Berura seems unclear. The bottem line is: if you will be wearing them sticking out of your pants (which many gedolim (great rabbis) did and still do) then you should do it in a way that it won't cause a chillul hashem. If you live in a neighborhood which is full of frum jews, it shouldn't be an issue because even though there are gentiles there, they are used to the jews way of dressing.
HUGE disagreement among the Poskim. Don't want to get too deep into it, but here is the summary (there are also different Pesakim in different cases- for all the details Yalkut Yosef is recommended):
- According to the Shulhan Aruch clearly (Orah Haim 8:11, 24:1) they Lechatehila should be revealed.
- Rav Ovadia Yosef (Yechawe Daat 2:1) holds the Tzitziot must be tucked in (see Halacha Berura ch.8, Yalkut Yosef ch. 8 and Or Lesion 2:2:2).
- Rav Yaakov Hilel writes (Gevurat HaAri pg. 137) that the Tzitziot must be revealed based on the Arizal (Shaar Hakawanot 7c and Olat Tamid 39a).
- According to the Hafes Haim they must be revealed and he is very harsh about this (Mishna Berura 8:26).