Have to disagree, Clanter. I think she looks fine on a huge horse. Her heels are below the flaps.
20 years ago the kids talked the BO into buying a jet black “Canadian” Percheron mare. They are smaller and more finely built than regular Percherons. They planned to make her a vaulting horse. She was probably at least 17hh. She was 3 y.o. and turned out with her mother and grandmother, who were pulling horses. They were starting her for pulling.
She never became a vaulting horse, nor did she pull anything. She was a lesson horse and anyone could get on her and ride. The really little kids - 7 or 8 yo - loved her but rode on bareback pads. She was pretty good at responding to aids through all that padding.
The only problem she ever had was when one of the barn rats got on her a few days after she arrived. BO and I were watching. BR stopped in the outdoor and sat for a few moments. Then she let loose a huge gob of spit. The mare jumped out from under her, straight ahead. BR landed flat on her back. Surprised but uninjured. We still laugh about it.
This is pulling at the Cumberland County Fair in Maine, for you suburban-types. Note the white line just ahead of the horses. Teams pull a sled loaded with huge concrete blocks. If they make it over the line they move to the next round with a heavier load. The winner is the last team to pull the heaviest load over the line. Plenty of rules protect the horses. It’s a very popular event.