So a friend of mine reached me with a request to do something with his biking pants. While being perfectly intact the bottox part of them has worryingly gone weathered and thinned down. That was the part to fix and in this instructable i'm going to show how i did it.

Step 1: Creating a Pattern

To reinforce the necessary area it was decided to follow existing pattern of pants design. To copy it I used masking tape and followed existing seams. Since the fabric of that area has stretched out some compromises had to be done to achieve relatively fitting flat template.

Step 2: Making a Template

After the pattern was done and removed it was transferred onto a piece of cardboard to be cut into a template.

Step 3: Cutting Pieces

For the patching material I used a pair of old white leather pants. The pattern was transferred, and after the allowances added on the inside the leather details were cut.

Step 4: Sewing Pieces Together

To connect two details into one piece I glued the inner edge together and sew it. After that the edge was folded back, secured with glue first and then with a seam. Regular glue stick is enough for this kind of job.

Step 5: Adding Reflective Stips

Since the original pants design contained reflective strips on this part I recreated it.

Step 6: Ventilation Perforation

Since additional layer of material is added it was decides to create a pattern of perforations to provide better ventilation. It was done with a hole punch.

Step 7: Gluing the Piece

Before sewind the piece down it had to be secured with some spray glue. At first the area was masked with masking tape and some paper. And at this part I made a slight mistake of not masking some area inward along the edge where the future seam would be. Sewing through the glue ended up being a frustrating and less than ideal endeavor. Nevertheless, after the both surfaces were sprayed with glue they could be attached. Spray glue doesn't create a death grip connection so some parts could be reattached and adjusted in process.

The other thing to mention is that since I was attaching flat leather pieces onto stretched fabric some fabric wrinkles appeared of which i couldn't get rid of so I just tried to spread them as evenly as possible.

Step 8: Sewing Down the Piece

To secure the edge of the piece with a seam I had to obtain an access to the innards of the pant. To do that I cut open the inner lining in the crotch area open along the seam. After that I could sew the piece to the pants.

Step 9: Sewing the Pattern

To reinforce the area a series of seams were done to attach leather to the fabric.

Step 10: Patching the Pocket

After all that done there was one more thing to take of - to patch some minor pocket holes. The leather patches were glued onto place first and then, since it couldn't be done with a sewing machine, hand stitched down.

Step 11: Finishing the Job

After sewing back the inner lining the reparation process was complete. My friend was satisfied with the result and I hope these pants are gonna serve him for quite a while more.

On this I'm ending this instructable, thank you for your attention and have a nice pants.