Perfumes like Idylle Duet Rose-Patchouli by Guerlain: closest alternatives
The closest matches to Idylle Duet Rose-Patchouli by Guerlain are Cheeky Alice by Vivienne Westwood (77% match), Émilie EDT by Fragonard and Les Impératrices Japonaises / The Great Empresses of Japan by Roméa d'Améor. Each alternative below is ranked by how closely its accords, notes, seasons and wearer votes line up, from any brand.
Closest alternatives

Vivienne Westwood
Cheeky Alice
2011 · for women
6.6 (83 ratings)
77% match · shares floral, powdery, Peony

Fragonard
Émilie EDT
for women
6.7 (65 ratings)
77% match · shares floral, Violet, Lily of the valley

Roméa d'Améor
Les Impératrices Japonaises / The Great Empresses of Japan
2009 · for women
7.5 (165 ratings)
76% match · shares floral, powdery, Peony

Bourjois
Soir de Paris (1991) EDP
1991 · for women
7.2 (37 ratings)
76% match · shares floral, powdery, Violet

Roja Parfums
Scandal (Parfum)
2007 · for women
7.6 (69 ratings)
75% match · shares floral, Freesia, Lily of the valley

Fragonard
Capucine
2005 · for women
7.5 (52 ratings)
75% match · shares floral, powdery, Woody

Bulgari Bvlgari
Bvlgari pour Femme EDP
1994 · for women
7.6 (284 ratings)
74% match · shares floral, powdery, Jasmine

Keiko Mecheri
Johana
2012 · for women
7.3 (106 ratings)
74% match · shares floral, powdery, Incense

Michael Kors
Michael / Michael Kors (2000) EDP
2000 · for women
7.4 (116 ratings)
74% match · shares floral, Peony, Freesia

Roja Parfums
Innuendo / Creation-I (Parfum)
2012 · for women
8.2 (87 ratings)
74% match · shares floral, powdery, Violet

Givenchy
Very Irrésistible Givenchy EDP
2005 · for women
7.2 (85 ratings)
74% match · shares floral, Peony, Patchouli

Caron
Fleur de Rocaille (1993) EDP
1993 · for women
7.0 (101 ratings)
73% match · shares floral, powdery, Violet

Lanvin
Rumeur (2007) EDP
2007 · for women
7.3 (235 ratings)
72% match · shares floral, powdery, Lily of the valley

Keiko Mecheri
White Petals
2001 · for women
7.3 (149 ratings)
72% match · shares floral, powdery, Peony

Kenzo
Flower by Kenzo Essentielle
2009 · for women
7.9 (62 ratings)
73% match · shares floral, powdery, Incense

Editions de Parfums Frédéric Malle
Iris Poudre
2000 · for women
7.7 (530 ratings)
71% match · shares floral, powdery, Violet

Rancé 1795
Joséphine
for women
7.5 (135 ratings)
72% match · shares floral, powdery, Peony

Burberry
London for Women
2006 · for women
7.4 (418 ratings)
71% match · shares floral, Peony, Patchouli

Narciso Rodriguez
For Her Musc Collection
2009 · for women
7.8 (249 ratings)
72% match · shares floral, powdery, Jasmine

Giorgio Armani
Armani Mania pour Femme
2004 · for women
7.7 (161 ratings)
72% match · shares floral, powdery, Peony

Karl Lagerfeld
Karleidoscope
2011 · for women
6.9 (82 ratings)
73% match · shares floral, powdery, Freesia

Yves Rocher
Cléa EDT
1980 · for women
6.6 (134 ratings)
72% match · shares floral, Lily of the valley, Patchouli

Kenzo
Flower by Kenzo Winter Flowers / Fleurs d'Hiver
2008 · for women
6.8 (30 ratings)
73% match · shares floral, powdery, Violet

Jil Sander
Style
2006 · for women
7.5 (443 ratings)
71% match · shares floral, powdery, Freesia
How matching works
Every perfume is compared on up to five signals. Community accord votes weigh the most, followed by notes, where rare notes count more than common ones like musk. Note families, seasons and the men, women or unisex leaning make up the rest.
The brand is never used, so a match from another house is as likely as one from the same house. When a perfume has no data for a signal, that signal is skipped instead of counted as zero.