The sign for "blouse" is a classic old sign that can be used
to mean either "shirt" or "blouse." I personally don't use it much but many
of my older friends still use it as their main sign.
The sign for "blouse"
is made by placing your right hand in front of your chest, palm down and
somewhat back. The side of your index finger touching your chest.. Move
your hand down to your waist in an arc ending with your little finger touching
your lower belly.
Personally, unless I'm eating a sandwich, I would do this sign with two
hands instead of just one hand.
BLOUSE (two handed version)
Also see: SHIRT