Jessica Simpson -- You Can't See Me Yet!

Jessica Simpson isn't ready to fully show off her new and possibly slimmer body ... going out in only non-revealing clothing and clutching a big bag close to her body.

TMZ posted pics of Jess earlier this week ... wearing multiple layers of clothing and holding a giant brown bag. Just this morning at LAX, Jess jetted out of town sporting a similar look, this time with a giant black bag.

Of course, Jess is no fool -- she's scheduled to appear on Katie Couric's new show this week to debut her slender, post-baby body ... so she's in no hurry to ruin that moment.

Clever girl.