Corporate and event orders are the least sport-like work we do, and they have their own constraints. The date is genuinely immovable — an event does not reschedule because kit is late — and the group is a cross-section of a company rather than a trained squad.
That changes sizing more than anything else. A club orders S to XL across athletic builds; a corporate group needs XS to 5XL across every shape, and a chart based on athletic fit will disappoint a lot of people. We use a relaxed block for this work and recommend a generous size spread.
Brand guidelines also matter more here than in sport. Marketing owns the identity, the logo has defined clear space and approved colourways, and kit that breaches it will not be signed off. Send the guideline and we work inside it.