This question already has an answer here:

Someone I know has a medical condition that prevents him from wearing tefillin on his bare arm. Can an ones wear the tefillin on his clothes, instead, or should he not wear this at all? If the 2nd answer, should he still wear the rosh tefillin alone?

marked as duplicate by Double AA Oct 7 at 14:56

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Browse other questions tagged .