How are you traveling? Considering you absolutely have to fit it into one suitcase, I'm going to assume you're going by plane (if not, sorry for the incorrect assumption XD). I'd suggest putting it in your carry-on bag. If you're traveling on land, just fold it up and put it into a duffel bag. Most hotels have irons, so if anything gets wrinkled, just iron it when you get there. A general space saving tip is to layer a bunch of things and then roll them, but that can damage cosplays sometimes.
+See Costume List for Completed Projects+
+Rarity+ MLP:FiM ~100%~ Just finished!
+Matryoshka!America+ Hetalia ~20%~ Designing the Hoodie!
+Ciel Phantomhive (Vol. 6 Outfit)+ Black Butler
+Hatsune Miku (Snow Version 2013)+ Vocaloid
+Conventions Planned for 2013+
Sakura Con 2013 ~ 65% Likely
Everfree 2013 ~ 30% Likely
Kumori Con 2013 ~ 40% Likely
Aki Con 2013 ~ 100% Likely