a couple of years ago when I was starting to ride bike, I skidded a little on some gravel on the road and jumped off my saddle in a hurry in order to put a foot down on the ground to keep the bike from skidding out from under me.
Unfortunately, my butt did not completely clear the saddle and I came down HARD on the saddle nose right on my tailbone.
I had to sit on the side of my hip for about 3 months, then it took another year and a half to heal completely....yes, that long.
Ever since then I have been VERY conscious about moving forward off my saddle well enough to completely clear it- no chance of me catching any shorts on my saddle nose anymore- I learned my lesson the hard way!

By the way, all my shorts are pretty long legged shorts, but I still have the problem with the leg elastic being too tight even though the rest of the shorts fit just great. This is true for like 3 different brands that I have. I originally tried on 6 brands to choose the ones with the least tight leg bands. If only they'd give that elastic band an extra inch of easement! Seems so stupid. I'm not even very heavy- just not what you'd call super slender....I'm 'curvaceous'.