check the copyright notices on the patterns you collect.
unless they expressly grant permission to make and share copies then you shouldn't.
check with the shops offering the patterns to see if
(1) they'd be willing to give you extra(s) to share; or
(2) if they sell online, do they offer the patterns on their website; or
(3) do they know whether/which other shops will also offer those patterns; or
(4) do they know of any other source from which your friend(s) can get those patterns.
__________________
- necessity is the mother of invention. lazy is the crazy aunt.
