These are the only two American branches of the classic Jermyn Street shirtmaker. They carry traditional oxfords and formal evening shirts ($110 to $199) in almost every shade imaginable, like a pink classic stripped shirt or a blue microcheck non-iron fit. Lively-colored ties abound to complement the bridal party, from bright gold skinny ties ($85) to pale purple handmade wovens ($99).

D&G

D&G caters to the svelte and stylish. Their blazers ($650 to $950) are super-skinny, and the pants ($275 to $395) even skinnier. Suits range from $825 to $1,100.

Dolce & Gabbana

Domenico Dolce and Stefano Gabbana offer sleek, au courant men’s garb for any mood, from tailored suits to a traditional three-button tux ($1,200 to $2,100). The Italian sartorial cut will ensure that the suit’s lifetime (and style) surpasses a couple’s golden anniversary.

Duncan Quinn

Rock and roll meets Savile Row at this shop, where it’s easy to find something to please the man who likes his style to have a little edge. Choose something from the ready-to-wear selection (suits from $1,950) or get a bespoke suit and tie (from $3,250).

Eisenberg & Eisenberg

This no-frills store has tuxedos from major designers at some of the lowest prices around. A worsted wool Perry Ellis tuxedo is $329 ($130 to rent); prices top out at $800. Formal shoes, cuff links, and all styles of cummerbund and vest will complete whatever choice the groom makes. They offer same-day alterations, perfect for those procrastinators out there.

Ermenegildo Zegna

A fourth-generation family business headquartered in Milan, Ermenegildo Zegna offers impeccably tailored menswear. The sartorial collection includes a single-button, three-button, or double-breasted six-button option. For $1,900 to $3,700, grooms can expect a suit or tuxedo cut to their tastes.

Etro

English classics with a swank Italian twist are popular among the Upper East Siders who swear by Etro’s bold prints. Their suits are no exception. The wool plaid suit (around $1,500), striped shirts (from $275), and jazzy ties ($125) are sure hits.

Giorgio Armani

The man who invented power dressing has continued to design suits (about $2,500) and ties ($115 to $135); his well-cut tuxedos range from $2,500 to $3,800.

Gucci

Fashionable men count on Gucci for the clothes they work and party in. And when they get married, Gucci delivers again with manifold options for polished, streamlined suits and two ultrastyled mohair tuxedos. The Signoria ($2,805) has a notch lapel with a satin trim; the Manhattan ($2,660) has a satin-faced peak lapel. Gucci also does made-to-order apparel.