Whatever you decide, expect it to be analyzed ad nauseam regarding fit, style, and (in)appropriateness for the occasion, then likely to have drinks spilled on it, and possibly, food/projectiles thrown at it.
Not having any MTM or bespoke suits and thus being unable to comment on the relative merits of going either route, I will stay out of that discussion. In the case of ties, however, in addition to the ties-at-thrift-stores idea, you should check out two SF members who have high-end ones for sale at really low prices: deveandepot1 and idfnl. There may be others on this forum, as well. Hope this helps.
BTW, welcome to SF!