Levi's Men's 517 Boot Cut Jeans

The last pair i bought of Hollister came apart at the seam between the 2 back pockets.. have you heard of this happening before?

Should i order jeans a little longer for wearing boots. i usually wear a 31x32. the 517 jeans shrink a bit correct? going to order the 32x34

If I wear a 40x32, what size in this pant would I need to order?

do they have 7 belt loops