A brain teaser of sorts that I’m working on asks this question, and I simply can’t come up with anything. It has to be an article of clothing, not a style (intimates).
I would appreciate any assistance.
Izods (okay, sort of a cheat, but I know they’re referred to as that)
Inverness cape.
(Checked this book – really? You don’t have one on your desk? – and that was the only “I” entry in 8 three-column pages on clothing.)
I suspect in-soles and in-socks won’t count. Good question, i’ve searched a couple of fashion glossaries and the I’s are definitely lacking.
Incontinence pants?
Ice skates?
Invisible Panties
Imaginary Trousers
[sub]OK, I made that second one up[/sub]
Thanks twickster, that qualifies, and I’m impressed with your book collection.
Thanks for not including a pic! 
You’re welcome! Word Menu is a great resource for anyone who works with words. (It’s one of the few books I kept at work after being moved to a cubicle [boo hoo] – I still haven’t sorted out the two cases’ worth I moved home.
Iguana-skin shoes.
eyeglasses
OK, OK, ihram
invisible sandals
Sandals made by nylon thread. Origin: designed by Ferragamo which won the “Neiman Marcus Award” in 1947.
and innerwear (you can look them up)
All I’ve got is an ivy cap.
anything you wear inside-out
Word Menu?
Why am I reminded of a Scene in Monty Python’s “Meaning of Life” ? Horribly Paraphrased here:
“Here are your conversation menus.”
“Conversation Menus?”
“Yes, these are some suggested topics you might wish to converse with your partner”
“Very well, Two for Phillosphy then…”
“Ok, two for Phillosphy, right away!”
“Well how do we get started?”
“Ask questions, Like why are we here?”
insole, or innersole? I see now that innerwear doesn’t work
Irish linen shirt
Iron-on patches
Iridescent fabrics
insignia