William N. answered 03/29/19
Fifty Years Experience in American Sign Language and Interpreting
This is an interesting question. As you recognize your actual ability to sign is pretty limited in this costume but I understand what you are trying to accomplish. There are several little phrases and signs you could make clearly in this costume. For example:
HAPPY MEET YOU (HAPPY is done very clearly with palm hand) MEET and YOU are done with index finger extended closed fist handshape but would still be clear in your costume
YOU MY SWEET HEART (although the romantic heart is usually signed with forefingers it is still clear using your whole mitten hand. As well as signing "YOU" with your whole mitten hand would be clear in this context.
LOVE YOU
COME HUG PLEASE
YEAH (applause in ASL). HANDS WAVING in air at head level
GOOD or BAD are signed with palm hand so could be done in your costume
YUMMY (like rubbing your tummy). Means PLEASING. \
PLEASE and THANK-YOU are done with palm hand so can be done in your costume
Hope this gives you some leads. I will leave to you to look up any of these signs that you don't know. Many resources on the internet or I would be happy to tutor you in a lesson focused on this type of communication when wearing a costume
Regards