I've never worn a costume at a convention. My ex-fiancee did and I was embarassed the entire time she was with me. Some issues I must have re: grown-ups wearing kids' costumes (but those are MY issues).
Having said that, I actually admire those who can make their own costumes and make them look good on them. I've seen some really bad looking ones & a few good ones at conventions.
My own first costume consisted of a sorta kinda looks like a
TOS shirt from a second-hand store with a homemade cardboard & model-painted insignia held on by a safety pin. Props were courtesy of the phaser/communicator/tricorder model kit I bought with paper route money & wore out exploring the corn & wheat fields on our farm.
“When all Americans are treated as equal, no matter who they are or whom they love, we are all more free.” -Pres. Obama
"A great democracy does not make it harder to vote than to buy an assault weapon." -Pres. Clinton