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Sorry - I don’t expect you to change your own habits or something, this isn’t personal. I work in this space, so to me it’s just a fact and not a matter of opinion. Air travel results in higher carbon emissions per kg-km than road travel by about an order of magnitude. Even for long haul flights.
The GREET model: https://www.energy.gov/eere/bioenergy/articles/greet-greenhouse-gases-regulated-emissions-and-energy-use-transportation
Exactly as you’ve described it: bust, waist, hip and leg length, but with leg length from hip to ankle. It would mean not all sizes are available for a given piece of clothing, but it would mean that on the rack or online, you could tell whether a piece of clothing would fit.