For the pants, start with a pair that wash how you want them to, then take them to a tailor to adjust the shape to be correct. Then you have pants to wear while you spend months and hundreds on the skills and tools that it takes to compare with garment-factory quality on the hard parts like sewing through 4-6 layers of strong fabric.
Making pants nicely from scratch is a losing proposition on all axes except bragging rights, compared to adjusting an off-the-rack pair to fit as desired.
For the pants, start with a pair that wash how you want them to, then take them to a tailor to adjust the shape to be correct. Then you have pants to wear while you spend months and hundreds on the skills and tools that it takes to compare with garment-factory quality on the hard parts like sewing through 4-6 layers of strong fabric.
Making pants nicely from scratch is a losing proposition on all axes except bragging rights, compared to adjusting an off-the-rack pair to fit as desired.