Well, that is exactly what happened last year when I was going through our "shirt stack". (We re-purpose men's shirts into aprons and children's clothing. I've found that anything over a Size 2 romper is almost impossible to get out of even the biggest of men's button up shirts.)
Anyway, I looked down and saw this soft flannel plaid shirt--with all the right colors for Autumn...and classic hunting jackets! I knew immediately what I was going to do and put it into my "to-make" pile.
I laid the pattern pieces out several times in an attempt to get all the edges cut so that the plaid would match at the seams. Next I waffled back and forth about whether or not I was going to line the jacket. Lining won out in the end:
Once I started the actual garment construction I ended up ripping the side seams out once or twice to get the plaid matched as best I could--but it was the pockets that really took time. I think I ripped the two of them out, collectively, about six times. BUT...it was worth it!
Once all the joining seems were together for both shell and lining, I set about prepping to put the lining in--in essence stitching down the facing flaps and hemming the jacket body and sleeves.
I forgot to tack it along the side-seams until I was all but done, so I decided against ripping the whole thing out in order to do so. Other than that, I basically followed the directions on the pattern. I did go and look at some of my own (store-bought) blazers and have some ideas for putting lining in the next time to make it look perhaps a little better. Still, all in all, I'm pretty happy with the way it turned out: