Good evening, Rusty!
I am sorry I wasn't around to answer your question.......I am only just back home!
It has been the most beautiful afternoon, so our walk became somewhat extended.....
Yes, "baht 'at" means "without hat"!
I have found you the entire lyrics of "On Ilkley Moor Baht'at" and an approximate translation from Google
Wheear 'as ta bin sin ah saw thee,
On Ilkley Moor baht 'at?!
Wheear 'as ta bin sin ah saw thee?
Wheear 'as ta bin sin ah saw thee?
On Ilkley Moor baht 'at?!
(Where have you been since I saw you last? On Ilkley Moor without a hat)
Tha's been a courtin' Mary Jane
(You have been going out with Mary Jane)
Tha's going catch tha death o'cowd
(You're going to catch a cold that'll be the death of you)
Then we shall 'av to bury thee
(Then we shall have to bury you)
Then t'worms 'll cum an eat thee oop
(Then the worms will come an eat your body)
Then t'ducks 'll cum and eat oop t'worms
(Then ducks will eat all the worms)
Then we shall go an' eat oop ducks
(Then we will all eat the ducks)
Then we shall all 'av etten thee
(Therefore we will have eaten you!)
That's wheer we get us oahn back
(So we get our own back!)
On Ilkley Moor baht 'at?!
There are various versions of the song on YouTube if you want to explore......
I wasn't overly impressed by the accents though in some cases.
It is best said /sung in "broad" Yorkshire.
You will have seen some beautiful scenery whilst watching the racing!
I hope your weather is as good as ours......it is looking good for the Bank Holiday weekend.