Ask the professionals for help

You can't do this on your own. With a cock like this you need professional help, that means biting the sour apple and embarrassing yourself in front of the shop employees.

You put on your sheet again and walk out of the dressing room. You walk up to the clerks "excuse me" you say in a low tone.

"May I help you?" one of the girls say with a smile. She's maybe 30, brunette with her curly hair in a ponytail.

"I don't know how to say this but no pants fit me" you say, as embarrassed as ever.

"I find that hard to believe. You're thin, but we have XS clothes that should fit." she doesn't seem to get the hint.

You remove your sheet and expose your huge cock in all its glory, pre-cum starts leaking on the floor, you realize the sheet is extremely wet from your pre-cum. The girls look down with their mouths open, unable to speak.

"My cock is too big for any pants in this shop. I don't know what to do." you continue.

The girls just stare at you, shocked at this crazy situation.

Annoyed you realize they won't be able to help you find any pants that will fit. The only way you can continue is to relieve yourself to squeeze a flaccid cock inside smaller ones.