A styleless way of dressing.    From Wordnet, Princeton University. 

Now I feel like the number of slipper wearers are gaining strength... and that when my husband scowls at my 'styleless' choice of footwear, I can say "Well other people wear them too!".    From Wordnik.com.  [Ten Things You Never Knew About Me: My 1 st Meme] Reference

"It was bland and styleless," remembered the broker.    From Wordnik.com.  [Recent Transactions in the Real Estate Market] Reference

Her black alpaca dress was as styleless and as shiny as a stovepipe.    From Wordnik.com.  [Bruvver Jim's Baby] Reference

While a photographer may have a style,photography itself is styleless.    From Wordnik.com.  [Using Photo Reference] Reference

The nicest thing I had heard said about them was that they were styleless imitators of the Deveels.    From Wordnik.com.  [Myth Conceptions]

I agree with Mark and Michiel a bit, perhaps a break or wrapping both floats in a p would work for styleless/semantic sake.    From Wordnik.com.  [Clean and pure CSS FORM design] Reference

In their styleless rubber-soled brogans, bad haircuts, and generic domestic sedans, they looked as out of place as someone on food stamps.    From Wordnik.com.  [Hi-Ya!] Reference

The young woman wore Coke-bottle glasses, no makeup and had perfectly styleless hair-nothing like the Dixie beauty queens that Clinton usually dated.    From Wordnik.com.  [Family Pride] Reference

I say "apparently," because the styleless style is perhaps the one best adapted to produce the sought-for effect.    From Wordnik.com.  [The Advance of English Poetry in the Twentieth Century] Reference

He saw nothing of Rome, nor wanted to: and what he did see at first, in passing, the styleless new districts, the square blocks of buildings, gave him no desire to see more.    From Wordnik.com.  [Jean-Christophe Journey's End] Reference

The north of the country had a history of using fur-state-run factories churned out styleless, utilitarian jackets, often made with raccoons, fox and even house cats - "freaky fur," as Benedetti calls it.    From Wordnik.com.  [The Globe and Mail - Home RSS feed] Reference

Suffice it to say that Stark / Westlake is the cleanest of all noir novelists, a styleless stylist who gets to the point with stupendous economy, hustling you down the path of plot so briskly that you have to read his books a second time to appreciate the elegance and sober wit with which they are written.    From Wordnik.com.  [About Last Night] Reference

(Westerners often have the image of the traditional burqa which we envision as a head-to-toe shapeless styleless black robe.    From Wordnik.com.  [Wearing the Muslim veil in the West] Reference

And so, I’m here to tell you that after a certain age—let’s say, thirty—ultralong, styleless hair makes you appear to be desperately hanging onto your youth or your man or both.    From Wordnik.com.  [Oh No She Didn’t] Reference

Both nature and photography are styleless.    From Wordnik.com.  [Using Photo Reference] Reference