Elizabeth exploded out of the gate in cosplay. There was a brief window where she was everywhere. I decided there were nine reasons for this.
!. The game came out literally just in time for Comicon and was 2 super popular 3+4. The costume had no weird wig or clothing so you had a good chance of coming up with something close enough right off the rack in 3 a short time and 4 cheaply 3+4+5 Because the costume was so close to looking like ordinary clothing with a small amount of sowing and/or fabricating you could get very close to the proper costume for again 3 little time and 4. little money AND 5 wear parts of the costume in regular life without anyone realizing it was part of a costume. Much easier to rationalize time and money spent.
6. Elisabeth had several costume changes; all of which were close to regular clothing; none of which were just a different version of another outfit.
7 The main costume (the cover costume) was blue. Not sure how that works but it does. people like blue.
8 The blue dress was stunning without being too revealing and the all the rest were very nice without being super revealing. and last but not least 9 The blue Elizabeth was so adaptable. With the mere addition or subtraction of few inches of fabric the outfit could go from Pin Up to something a grandmother from 1880 would approve of. Sexy Iron Man costumes are not armour anymore. I don't know what you could go to a slave Leia costume NOT sexy. But every type of woman from shy to bold can dress as Elizabeth depending on how she cuts the fabric and both versions would still be very close to the original. Even your practical pants suit doesn't stray far from cannon.