Even the sun-clouds this morning cannot manage such skirts.
Nor the woman in the ambulance
Whose red heart blooms through her coat so astoundingly –
A gift, a love gift
Utterly unasked for
By a sky
Palely and flamily

 It’s very easy for readers to miss the implied scenario of this poem. Plath appears to be standing in a street, looking at poppies in October (when poppies, especially in England, are no longer in flower), but this is impossible as poppies are never sold as fresh cut flowers, least of all in October.  An ambulance drives by and men are walking on the street but Plath is focused on the flowers. So she is describing a hypothetical and not literal world. In her mind she may see the flowers as an imaginary gift, something special and lovely offered to her. Maybe they represent her skill as a poet. 
 The ‘love-gift’, however, does have a possible literal meaning, in that it also suggests pregnancy and perhaps a baby outside marriage. This may link with the woman bleeding, possibly from a miscarriage —  though the poem suggests it’s her heart  — in the ambulance. This element of the  poem seems not, as far as the reader is aware, to be autobiographical. There is no evidence that Sylvia Plath had a miscarriage at the time this was written. 
 Whatever the source of the idea, the ‘love-gift’ implies joy in motherhood and pleasure in life.
Poppies in October