It's called wearing underwear. It tends to help.
Dear Sir,
I thought I'd put pen to paper to air my thoughts on your recent foray on the internet. It's been lovely to hear your witticisms again but I thought perhaps we might want to carefully consider your personal perspectives and bias on the issue.
As you know, it has been 6 years since you last saw your penis. Obviously, your distended gut and swollen liver plays a role there but more than that, the large amount of fat around the base of your penis means that only an inch or so juts out. As such, you don't really have the 'play' in the nether regions to create a noticeable schlong swing.
So, whilst I do understand that in your case, the thinnest covering of cloth will stop dead any movement. This is merely because you don't have enough free penis weight to gather momentum to break the relatively flimsy hold of even your faggiest pair of see through thongs worn thin through 15 years of washing.
On the other hand, even with fairly weighty fabric of a new pair of lycra undergarments, I still find it necessary to so a swing test before a run. This is because I have my flaccid member has more swing in it.
Simple physics really. Center of gravity and all that.
Yours faithfully
Pedro