Comfort Zone

I know I have been sewing for more years than I care to remember but I have always kept within my comfort zone. Now I am looking at different blogs and doing my research on the internet I am wanting to try new techniques...I have always lined my trousers the normal way (making a full lining the same way as the trousers and joining them together at the waist) there isn't anything wrong with that I just want to try something different. So with these summer cotton and linen trousers I am going to underline them......I am going to underline them with silk organza (which costs more than the fashion fabric) to 2" below the knee. Now most blogging people just line the front with silk organza but what happens to the back of my trousers if I get a saggy bum.....so I have decided to underline the back as well.