I am assuming that you are very familiar with you horse but I will just throw this out there. Being a draft owner I am speaking from my experience. Sometimes draft owners think that their horse is much bigger than he is. My guy is a working size Belgian smaller than the ones you see in shows. Anyways he fits in a German full size bridle. I make a point of it being German because German bridles tend to be more adjustable. If you do go with tack that is specifically for drafts try to see it before you buy. Sometime the quality is not that great.
I have a Heritage oversized. My horse seems to have a large head, but he's on the very short end (last hole!) of the cheekpieces and caveson. You might do a search and take measurements. I got the oversize because I needed the larger throatlatch and browband.
It is not a draft size, but unless your horse has a head the size of Texas I think it would probably be large enough, unless the throatlatch and browband are too small.
I got a Crown Jawband Flash Bridle from Dover in O/S for my full percheron. I never thought it would fit. It looks great. I should even punch some holes in the flash attachment. It came with reins, too. There plenty long enough. I might get a fancy brow band from drafttack.com. They had accouple that look nice.
measure your horses head before you go buying anything
you need to know the total measurement from bit to bit over the head
also the width of the brow band
the measurement from the base of the ear over the head to the base of the other ear (crown piece)
and the throatlatch measure
We found with our bigboys that they needed the oversize at the top of the head but shorter cheekpieces than the big bridles came with
If you have measurements in hand you can compare to actual tack out there
If you are anywhere near the Amish, you can get a really nice custom bridle done for a reasonable price and made to size. This allows you to pick the features you like (color, leather width, stud or buckles at the bit end, etc)
I bought a O/S Passier for a mare two years ago and it fits great. I love it. I bought another (slightly different O/S Passier model, this one has the padded crown). It doesn't fit her or her daughter (that I bought it for). Both mares have fairly long heads. I was so bummed. The two bridles are about six inches different in size (seriously). So, be careful, even when looking at the same brand. These were both from Dover. Make sure you phone up and get the measurement and measure your horse's head before buying. They don't like to do it, but they will, if you really, insist. Many O/S are huge and many fit the average W/B.
Weaver bridles aren't fancy but they are sized correctly for a draft head and they are very adjustable.
thanks for all the suggestions, unfortunately my Shire really does have a huge head, but so is everything else! size 9 shoes. I am having a custom halter made because all the draft halters look too "drafty" and heavy or industrial! We like to look classy and stylish too!
I may be stuck with not so pretty stuff!, can't afford a custom bridle right now!