corbinam
Moderator
If they need to be thinned you can work it two ways, one go from the bottom up and work the scissors deep in the pants so you are removing the coat in the middle, where you wont see it
This is what I do, too. I take the thinning shears perpendicular to the ground facing up and put them in the pants (from the bottom) then put them close to the skin and snip. I brush that out, then do it again.

If you get the photos we can see him go from 'sheltie sweat pants' to 'sheltie skinny jeans'
Good luck!