Sister switches Packages?

A man & his sister go shopping for gift's for his sweetheart's

Birthday. He buys gloves & sis buys panties. On the way home

Sis switches packages in the bag. Without checking, the man send's his sweetheart the package with a note attached:

Honey, I didn't forget your Birthday. I chose these cause I noticed you didn't wear any & my sis & the saleslady said

everyone should have at least one pair. The saleslady showed me a pair she had been wearing for 3 wks. & were hardly soiled. She told me to let you know, when you take them off, to blow in them for they will be damp from wearing them & be sure to keep them on when you wash them so they won't shrink.

Love Your Dearest.

P.S. Just think of the number of times I will kiss the back of them during the coming year!