I'm fairly positive the "T" is for Timothy Lovejoy, the reverend. The white part on the letter's "pants" looks like that robe he wears and he has his hands outstretched like that a lot.. Idk, could be Troy McClure. X is definitely for xt'tapalatakettle a gift Mr Burs gave to Bart for donating some of his blood (a very rare type), to save his life.
2. Skeleton Sandals